K-12 Math Sites
by
Gina Otto

Check out Multiplication Tips

Images from What Good is Math/Mathletics

MATH RESOURCES, LESSONS AND INTERACTIVE SITES

AAA MATH - http://www.aaamath.com
This site contains hundreds of pages of basic math skills, interactive practice, an explanation of the math topic on each page, several challenge games and randomly created math problems from K to 8. The site is arranged by grade level or math topic -- cool.

ABACUS - http://www.ee.ryerson.ca:8080/~elf/abacus
You or your students can receive instructions here on how to add or subtract using this ancient yet modern calculator. A good site to help you supplement your units on Asia or the ancient Aztecs.

Math games by grade level. Neat way to practice/learn math skills.

ALGEBRA: IN SIMPLEST TERMS  - http://www.learner.org/resources/series66.html
The Annenberg Foundation provides a total of 26 episodes in this "Algebra: In Simplest Terms" series that covers such topics as linear relations, the ellipse, rational functions, and geometric sequences. Narrated by Sol Garfunkel, the series uses practical examples as illustrations of various principles and axioms.NOTE: to watch the videos, visitors will need to fill out a free online registration form.

Dozens of colorfully illustrated pages with explanatory lessons and interactive practice games  Using the Table of Contents, you can jump directly to one of ten chapters (such as Multiplying Fractions, Reducing Fractions and Comparing fractions) or start at the beginning (Basic Fractions) and use the Next Lesson link to continue through the site.  My favorite clicks are the timed exercises you'll find at the bottom of each lesson page.

ALLMATH FLASHCARDS - http://www.allmath.com/
Click on flashcards on the left. Choose your operators (any combination of addition, subtraction, multiplication and division.)  Then choose what size operands (from ten up to a hundred) and if you want to keep score.  Finally you have the option of AutoFlash, which will change cards automatically at a variety of speeds, from every two seconds up to every minute.  This really keeps things moving -- and adds a bit of game show excitement! Also fun and games for other math related stuff.

<>A+ MATH! - http://www.aplusmath.com/
This web site was developed to help students improve their math skills.  Visit the game room and play exciting games like Matho and Hidden Picture...Test math skills with Flashcards or Math Word Find puzzles. Create and print your own set of flashcards with Flashcard Creator. Also see Worksheets section, where you can print worksheets to practice offline. Try the Homework Helper to check your homework solutions, download games free. Has flashcard creator.

A+ STUDENT'S GUIDE TO MATH - http://www.whoishostingthis.com/resources/math-student-resource/
A resource to why math is important. Link may not be permanent, but check it out.

A comprehensive site for common quests plus a link to contact Dr. Math yourself if you can't find your answer on his site.

BASEBALL REFERENCE - http://www.baseball-reference.com/
One of the hobbies that has taken root as an offshoot of our national pastime is the compilation of baseball statistics and mythology. Baseball reference is a fully searchable, one stop site that brings together all the facts, figures and lore fans crave. Here you will find everything from batting averages and career leaders to team profiles and birthdays. And the links to news, analysis and travel information makes this site as useful as it is fun. Have your students practice as they plan a week-long travel itinerary following their favorite team's schedule.

<>BATTER'S UP BASEBALL - http://www.prongo.com/math/
Students need to correctly answer multiplication or addition Math problems in order to advance runners around the bases and score runs. Select a level of difficulty and answer problems as they appear on the screen in order to get singles, doubles and homeruns. Each wrong answer is a strike and a player gets three outs for a game. Needs free Flash plugin installed.

CALCULATORS - http://www.calculators.org/
Free, on-line calculators.

CHANGEMAKER - http://www.funbrain.com/cashreg/index.html
A Funbrain simulation in which students can practice making change for a dollar or for one hundred dollars.

COOLMATH.COM - http://www.coolmath.com/
An amusement park of mathematics,  this site has loads of lessons, activities, links and resources. Check out games at  COOLMATH4KIDS at http://www.coolmath-games.com/

COUNTERFEIT DETECTION - http://www.indigoimage.com/count/index.html
How do you know if your money is counterfeit or genuine?  Visit this fun site and learn all about the security features on a banknote ... the bits that make them difficult to copy. Then take a look at your own money and decide for yourself.

COUNTON - http://www.counton.org
This website from the UK has many areas for students to explore in the area of maths (mathematics). You can click X + Y Files,  Puzzles, features describing mathematical tools, and many activities that appeal to students from kindergarten to eighth grade.  Students in the UK can also participate in competitions.

<>CREATE A GRAPH - http://nces.ed.gov/nceskids/graphing/classic/
The National Center for Education Statistics created this online tool so that anyone can make an  area, bar, pie or line graph and print it out or download the image to a computer or disk. Older students can benefit from the link that shows how graphs can be used in probability. Younger students will quickly learn the difference between the left X and Y axis when they need to create their own line graphs.

EDUCATIONAL QUIZZES, ONLINE TESTS & TRIVIA - http://www.quizzes.cc/
This site provides math quizzes for teachers and  students. You can create a quiz and select the range of numbers you'd like to use. Students can grade the quiz online and generate new problems for more practice. You cab use the quizzes on this site for times tables, multiplication, addition and subtraction.

ELEMENTARY PROBLEM OF THE WEEK - http://mathforum.org/sum95/ruth/elem.pow.html
Challenges elementary students with problems and encourages them to verbalize solutions. In conjunction with a companion project, registered students have their submissions answered by "Visiting Math Mentors" and also have the opportunity to become a mentor

<>EUCLID'S ELEMENTS - http://aleph0.clarku.edu/~djoyce/java/elements/elements.html
All 13 Books are illustrated - even those on solid geometry that are three-dimensional; superb HS Geometry site.

EURO - http://www.surfnetkids.com/the_euro.htm

FAMOUS PROBLEMS IN THE HISTORY OF MATHEMATICS - http://mathforum.org/isaac/mathhist.html
The Math Forum offers this wonderful collection of timeless Math puzzlers such as The Bridges of Konigsberg, the Pythagorean Theorem and the properties of prime numbers. This is a great companion to the AIMs Historical Connections in Mathematics series.

FIBONACCI SEQUENCE - http://www.surfnetkids.com/resources/fibonacci-sequence/
"Leonardo Fibonacci, sometimes called Leonardo of Pisa, was a thirteenth-century Italian mathematician. He was instrumental in bringing the Arabic numbering system to Europe to replace the use of Roman numerals. He is also remembered for a series of numbers that now bears his name. The Fibonacci sequence starts with 0, 1 and each subsequent number is the sum of the two previous numbers. The first ten numbers in the Fibonacci series are: 0, 1, 2, 3, 5, 8, 13, 21, 34, 55." So starts Barbara Feldman's links to fibonacci numbers. Check them out.

FIGURE THIS! - http://www.figurethis.org/
Figure This! is a series of fun problem solving challenges presented by the National Council of Teachers of Mathematics that combines creative ideas with sound Math principles. About 40 challenges like How long would you have to wait if you were number 300?  In Spanish and English.

Follows the National Standards for Financial Literacy, this site is divided into grade levels, and contains a mortgage calculator. Really neat.

FINANCIAL LITERACY FOR KIDS - http://www.surfnetkids.com/resources/financial-literacy/

“Although there is more to learn about money than how to count coins and bill, the subject is largely ignored in most middle and high-schools. But somewhere between giving them an allowance and waving goodbye as they move out of the house, kids need an introduction to financial literacy, including learning about earning, budgeting, saving and investing.” Check out the links on this Barbara J. Feldman site. Great. Has links to games like Financial Soccer, Money Metropolis and Financial Literacy Word Search.

FRACTION TO DECIMAL CONVERSION - http://www.sisweb.com/math/general/arithmetic/fradec.htm
A handy reference on converting fractions to decimals. Fractions from 1/1 to 31/32 are neatly organized into a table showing their decimal equivalents.

FRACTIONS - http://www.surfnetkids.com/fractions.htm
"Do fractions make you sweat?  Whether you are a student or a parent helping a student, I've found five sites that will take you by the hand and explain everything you've always feared you could never learn about fractions. Take a deep breath. Ignore the pop-up window." From Barbara Feldman.

FRACTIONS - http://www.iit.edu/~smart/dvorber/lesson5.htm

FREE WORKSHEETS FOR KIDS - http://www.k5learning.com/free-worksheets-for-kids
Free worksheets for grades 1 thru 6 in math,  numbers, shapes, colors and other skills for preschools and kindergarten, reading comprehension grades 1 to  5, grammar forgrades 1-3, cursive writing worksheets and sample lessons. Neat!

FUN MATH LESSONS - http://math.rice.edu/~lanius/Lessons/
Cynthia Lanius of Rice University presents this myriad of Math lessons ready to use with students. Check out Let's graph, Fun and Sun Rent-A-Car , the Million Dollar Mission  and Geometry Online.  Something for everyone.

GAME AQUARIUM - http://www.gamequarium.com/
Games and activities, videos, ebooks and printables are included in this in all subjects. Just scroll past all the ads to find the link you want. Every subject, every grade is included.

GRAPHING IDEAS - http://www.abcteach.com/directory/subjects-math-graphing-647-2-1
Choose from hundreds of graphing activities to teach your students how to create pie charts, bar graphs, line graphs, and picture graphs. If you join abcteach for free, you can use the graphing worksheet generator. Neat!

<>GREAT GRAPHING RESOURCES GRADES 1-8 - http://www.startlocal.com.au/articles/educational_graphs.html
Have you ever noticed how ocean waves move? The up and down pattern that they makes is called a wave graph. Such graphs are an important part of science topics such as sound, heat and energy. Believe it or not, the heart pumps blood in a wave pattern also which can be drawn on a graph. Graphs are a part of everyday life. In fact, we use them daily for directions and counting!  This site by StartLocal for grades 1-8 is really interesting and has graph games, explanations of different types of graphs

HANDS-ON MATH ACTIVITIES FOR KIDS  - http://www.education.com/activity/math/
From easy, hands on math activities to more advanced games and puzzles, you can find it all. Use the boxes on the left to narrow your search bygrade level or by specific categories.

HELPING WITH MATH - http://www.helpingwithmath.com/
If you are a parent who wants to help your child with math then HelpingWithMath.com is a web site for you. The math worksheets , the printable multiplication tables, the math charts, the multiplication games, and our other resources are completely free and easy to use.

HISTORY OF TIMEKEEPING  -  http://www.watchshop.com/from-hourglasses-to-watches-the-history-of-timekeeping-a138.html
From hourglasses to watches time is one of the most important parts of our lives. Check out this site with links to time.

HOODA MATH - http://www.HoodaMath.com/
Hooda Math is all about making math fun. Visit the games page to play math games which help reinforce math concepts. Watch a tutorial to learn math concepts. THIS IS A NEW, CUTE MATH SITE BY A MATH TEACHER.

HOW FAR IS IT? - http://www.indo.com/distance/
Calculates the distance between two places, you input the locations - from the U.S. Census Bureau.

INTERACTIVE MATHEMATICS - http://www.intmath.com/
...where you learn math by playing with it.

KID NUMBERS.COM - http://www.kidsnumbers.com/multiplication.php
Addition, subtraction, Multiplication, Division, Fractions, telling time, mixed skills, geometry and algebra are all included in research based program. Best of all, like everything on the KidsKnowIt Network, it is 100% FREE. Use the free games and math activities to review, and keep your math wits sharp, or use the program to develop the basic brain skills that are required to succeed with math.

<>KIDS CLICK - http://www.kidsclick.org/
A web search for Kids by librarians, includes topics like Weird & Mysterious, the Arts, Math and Science and Literature.

KIDS EDUCATIONAL COMPUTER GAMEShttp://www.turtlediary.com/?id=mailer
These online kids games by TurtleDiary start with pre-K amd teach great stuff – continents, math, the five senses, phonics, upper and lower case, times tables. You need it, it’s here free. You can search for games, stories, worksheets by grade/age PreK-2. Try the Food Chain game for second graders. Really fun.

LAURA CANDLER'S FILE CABINET - http://www.lauracandler.com/filecabinet/index.php
In the file drawers, you will find all sorts of activity sheets and blackline masters created for the classroom. All of them are in PDF format, so you will need the free Adobe Acrobat Reader plug-in to view and print the files.

This site was suggested by a girl scout leader who read my website to help her girls earn their "Money Counts" finacial literacy badge. On the site, kids can find heaps of personal finance resources, find out what a budget is and how to make one, learn about saving, and check out a comic to learn how banks function. There are money and finance games, printables, webquests and projects, and teaching resources for educators and parents. A treasure trove of info on money...Good place to start.

LEARNING WITH ENGLISH GAMES -http://www.jumpstart.com/parents/games/english-games
Games and printable worksheets for preschool to 6th grade, including English and Math practice. Cute from Jumpstart. Also links to apps for your smart phones.

MANIPULATIVES  -http://mason.gmu.edu/~mmankus/Handson/manipulatives.htm
You can print out and copy onto card stock...pattern blocks, geometry shapes, Base Ten blocks, algebra, rods, attribute Blocks and more... Share with your math teachers.

MASTERING FRACTIONS IN MATH - http://www.startlocal.com.au/articles/educational_fractions.html
"Would you like one-third or two-fifths of the chocolate fudge cake at your friend’s birthday party? This is just one example of fractions. Be it homework, food, or play, fractions can help lots in our everyday lives!" Check out this site.

MATH ARCHIVES - http://archives.math.utk.edu/
Archives, searchable database, software, K-12 teaching materials and links.

Targeting 7th grade – this is a collection of top resources for parents and educators who work with students struggling in reading and/or math. Great to have handy when looking for resources to share at conferences, in newsletters, and with colleagues.

MATH BLASTER - http://www.mathblaster.com/coolmath/
This site ha games, activities, worksheets with problems and practice grades 1 thru 8th. On the front page is the math joke of the weeks. There are even apps available for IPhone and Android like B=Force Blaster, Hyperblast and Monster Mutt Rescue.

MATH CATS - http://www.mathcats.com/contents.html
Includes interactive activities requiring a free down load of MicroWorlds Web Player, an art gallery, math games, tessellations, and other things.  Cute.

MATH.COM   - http://www.math.com/
Lessons and resources for math teachers of all ages. The references are very useful, such as English-Spanish Math Translations and the Glossary of Math Terms. You can generate Algebra Worksheets online, as are test prep for the SAT, ACT and more. Some links on this site are for registered (often paying) users, but there is much a math teacher to use with his/her classes.

MATHEXPRESSION.COM - http://www.mathexpression.com/trapezoid-practice.html
Videos, study tips, step by step solutions, this site is neat, but hard to navigate because of the multitude of ads.

MATH FOR THE LEFT AND RIGHT BRAIN - http://www.ixl.com/?gclid=CL24jYirpKoCFQUHbAodpAk9Xw
For grades Pre-K to 8 there are activities for each grade level, 255 skills, and 20 practice problems. The State standards are listed for every state.. You can use some of  the features free, or become a member.

MATH FORUM: PRE-K LESSONS - http://mathforum.org/teachers/pre-k/lessons-individual.html
Pre-Kindergarten and primary grades individual lesson plans.

MATH GAMES - http://www.coolmath-games.com/
Strategy, skill, numbers, logic and more are used in the variety of math games on this site. Examples include Monster Mover 2, Unlucky Robber and Parking Panic among others.

MATH GOODIES - http://www.mathgoodies.com/
A free math help site featuring interactive lessons, homework hel, worksheets and forums. Over 400 pages of activities for students, teachers and parents.  This is an award-winning site reviewed on television, radio and in major newspapers.

MATH IN DAILY LIFE - http://www.learner.org/exhibits/dailymath/
Another great site from the Annenberg Project, answers the question how do numbers affect everyday decisions? For those who hate math, check this out.

MATH IN THE MOVIES PAGE - http://world.std.com/~reinhold/mathmovies.html
A Guide to Major Motion Pictures with Scenes of Real Mathematics

MATH IS FUN - http://www.mathsisfun.com/timestable.html
This site has times tables practice, plus links to algebra, geometry, data, measure, puzzles, games and worksheets. All Free!

<>MATHEMATICS OF CARTOGRAPHY - http://math.rice.edu/~lanius/pres/map/
Well-done interdisciplinary tutorial on map making - not too heavy on the graphics either; from Rice University.

MATH MAGIC - http://mathforum.org/mathmagic/
Challenges in each of four categories (k-3, 4-6, 7-9 and 10-12) to trigger each registered team to pair up with another team and engage in a problem solving dialog. Superbly done

MATHPOWER.COM  - http://www.mathpower.com/
Basic math skills are explained very clearly in student tutorials, where students explain step-by-step how to solve unequal equations, algebra word problems and factoring polynomials. Homework assignments are available, as are study and test-taking tips. There are video snippets by Professor Freedman to explain some basic concepts such as additions and subtraction of signed numbers.

<>MATH PUZZLES - http://www.cut-the-knot.com/
Interactive Math Miscellany and puzzles.  Just click on a topic and make a puzzle.

MATH PUZZLES BY BARBARBA FELDMAN - http://www.surfnetkids.com/resources/math-puzzles/
Puzzles can be used to engage kids who don't like math...here are links to great sources.

MATHS FOR ALL - http://www.emathematics.net/
From 1st to 8th grade and algebra and geometry, this site, a members’ site, has free worksheets and practice problems. The site includes percentages, fractions, volume ,Inequalities, variable expressions, equations, linear equations, 2-D shapes, and graphs and charts. There are also links to precalculus and trig. Seems to be all inclusive. Check it out. Teachers can monitor the progress of each student as a member.

MATH WORKSHEETS LAND  - http://www.mathworksheetsland.com/
This site has over 16,000 PDF files, preschool to high school. Really cool . It’s like a free book/books. I like the guided lessons and the artwork on the pages. Great Artwork!

MEASUREMENT CONVERTER - http://www.convert-me.com/en/
Online calculator which can convert units of measurement for weight, capacity and volume, length, area, speed, pressure, temperature, circular measure and time. Simple to use. Ignore the flashing lights and don't by anything.

MONEY MATH EDUCATION - http://www.howtosavemoney.me/education/index.php
Choose a quiz, enter the answers and check…Create new problems. Your choice. The site has easy, medium and difficult quizzes. Interesting.

<>MONEY, MONEY, MONEY  - http://www.angelfire.com/il2/colettemcgrew/teachersection.htm
This unit on money was created for third grade students, integrating the history of currency, with mathematics, and real world issues such as saving money. The student section is student driven and interactive.

MR. PITONYAK'S PYRAMID PUZZLE  - http://wcvt.com/~tiggr
This site features an interdisciplinary Web-based project designed for middle school math students to determine how much it would cost to build an Egyptian pyramid today.

MONEY SMARTS - http://www.surfnetkids.com/money_smarts.htm
"Whether you use chocolate chips, monopoly money, or actual coins, it's never too early to start learning about money. This... roundup of sites [by Barbara Feldman] offer[s] games and interactive tools to help kids and teens gain financial literacy."

MUDD'S MATH FUN FACTS - http://www.math.hmc.edu/funfacts/
Hosted by the Math Department of California's Harvey Mudd College, Math Fun Facts offers a searchable database of all kinds of intriguing facts that connect Mathematical knowledge to all kinds of everyday applications. Like "Why an International Date Line?", "Sure Betting on Different Beliefs" and the "Ham Sandwich Theorem". Ideal for middle school math classes and above.  Great!

MULTIFLYER - http://www.brainormous.com/
Multiflyer is a fun online game developed to help anyone who is learning multiplication tables. It takes place in space and even sprinkles in learning about the planets. You can play it online, or register and receive a full downloadable version as well as downloadable interactive support tools. The game lets you figure out the answers, or you can turn off the table and wing it on your own. Simple, fun diversion to help reinforce multiplication skills. Other games on this site as well.

MULTIPLICATION - http://www.dositey.com/2008/index.php?page=free_activities&sub=34&subsub=m&sub_3=multi
This site has exercises, worksheets, lessons and games about multiplication . It is neat to solve an equation and reveal a hidden picture. You can print a worksheet to practice the times tables.

MULTIPLICATION - http://www.surfnetkids.com/multiplication_games.htm
Is drill and practice the only way to learn the multiplication tables?  The site offers some interesting answers.  Check out Barbara Feldman's math links. Join her listserv.

MULTIPLICATION.COM  - http://www.multiplication.com
Techniques, tips and secrets used by master teachers. Full of links to online activities, classroom games, and software. Choose the section for Teachers, Parents of Students. Also http://www.multiplication.com/interactive_games.htm  Free interactive math games like Farm Freak Out where you help get the animals back in their pen, Cone Crazy where you scoop the correct ice cream to keep your customers happy., and Fish Shop where you keep the customers at the 'Fish Shop' happy by scooping out the correct fish.are designed to help students learn the times tables.

MULTIPLICATION: AN ADVENTURE IN NUMBER SENSE - http://naturalmath.com/2014/04/multiplication-a-parlor-finger-trick/
Join in on the conversation between a student ("There are too many multiplication facts to memorize.") and a mentor ("If you want to  know the multiplication table from 1 to 10, you may want to memorize 13 facts, at most. There are very easy tricks that will let you get the rest of the facts as fast as if you remembered them.") You'll learn which thirteen facts you need to memorize, and how to recall the rest of the multiplication table using fast mental arithmetic and number sense.

MULTIPLICATION TIPS- http://mathforum.org/k12/mathtips/multiplication.tips.html
To multiply by nine on your fingers, hold up ten fingers ?  If the problem is 9 x 8 you just put down your eighth finger and there is your answer: 72.  If the problem is 9 x 7 just put down your seventh finger: 63. If you are multiplying 5 times an even number, halve the number you are multiplying by and place a zero after  the number. Example: 5 x 6, half of 6 is 3, add a zero for an answer of 30.  Toss your calculator.  Learn these student-submitted tips for calculating times five, times nine and times eleven  in your head.

MULTIPLICATIONTABLEPRINTABLE - http://www.multiplicationtableprintable.com/
And a game to play as well.

NICK'S MATHEMATICAL PUZZLES - http://www.qbyte.org/puzzles/
It is a collection of puzzles ranging over geometry, probablility, number theory, algebra, calculus, and logic. Hints are provided along with the answers, fully worked solutions, and links to related mathematical topics. Many are elementary in their statement, yet challenging. New puzzles are to be added weekly.

ONLINE MATH WORKSHEETS - http://www.schoolexpress.com/funtime/math_generator/index.php
16,000 plus free worksheets, online (self-graded questions to doonline and print, or print worksheets for offline work.

<>PEANUTS AND CRACKERJACKS - http://www.bostonfed.org/peanuts/index.htm
A look at the economics of professional team sports through this fun site. There's a baseball simulation that tests student knowledge of economics and trivia, and a sports page section that covers all the fundamentals of economics. The teacher section has approximately fifty activities and lesson ideas in .pdf format, and they are all correlated to state standards.  You play on-line.

PROBLEM-SOLVING SKILLS - http://educationdegrees.nova.edu/resources/infographics/infographic-4/

Building students’ problem-solving skills is among the modern teacher’s most valuable strategies for ensuring students’ success in the classroom and in the world. See how you can start unlocking students’ problem-solving potential today using the graphic on this web page.

<>  PUZZLEMAKER - http://puzzlemaker.school.discovery.com/
Create your favorite puzzle or choose a puzzle from the list.  Mazed Things, computer generated mazes, word searches, criss-cross puzzles, number blocks, word searches with a message, math squares, cryptograms, letter tiles and fallen phrase puzzle.  Check it out.  Hosted by Discovery Channel.

QUIA
- http://www.quia.com/jg/1066.html
Multiplication (2 - 9).  This is a game to practice your times tables using the numbers 2 through 9.  One is Flashcards and the other is Concentration.  Great  practice.  Has a link to email the activity to a friend.

THE SCHOOL ATHLETICS CENTER - http://www.edgate.com/school_athletics/student/sporting_articles/
Play Ball! Teachable Science and Math Ideas about Baseball Educators, take a look at these sites to learn how you can use baseball to teach science and math. Students, check out these cool, sports-related activities.

SEQUENCES AND SERIES - http://www.surfnetkids.com/sequences_and_series.htm
Studied in first year algebra, "a sequence is an ordered list of numbers, and a series is the sum of the terms (the individual numbers) of a sequence." This site by Barbara J. Feldman has a neat list of websites that help the student see a pattern, including games.

STOCK MARKET GAME - http://valuestockguide.com/tools-for-teaching-the-stock-market-game/
Lots of ways to teach how the stock market works, the math concepts that go along, and history. Lesson plans galore.

SYMMETRY AND PATTERN: THE ART OF ORIENTAL CARPETS - http://mathforum.org/geometry/rugs/index.html
The study of symmetry offers one approach to analyzing patterns in Oriental carpets. Through symmetry analysis we may identify areas of pattern that exhibit expected repetitions, and areas that vary from that expectation.

TESSELLATING ANIMATION - http://www.k4.dion.ne.jp/~mnaka/home.index.htmll
Japanese artist Makoto Nakamura awesome animations; his tessellated birds fly, his tessellated fish swim, and his tessellated dancers dance.  Visit Nakamura's Jigsaw Puzzles (link at the bottom of the page.)  Here you will have a chance to reassemble tessellated cats, pigeons, gorillas and more.  Each interactive puzzle is unique and intriguing in its own way. Having trouble? Click the pieces to rotate them.

THINKS.COM - http://thinks.com/
Puzzles, games and lots of materials to promote problem solving strategies
THRILLS AND CHILLS WITHOUT THE SPILLS -ROLLERCOASTER PHYSICS FOR MIDDLE SCHOOL - http://www.angelfire.com/on2/thrillsandchills/
At this site create your dream roller coaster ride and test it in a  virtual amusement park. Explore physics and math through a roller coaster design competition by building a working scale model. Compete  on-line with other middle-school students. Also included is a scavenger hunt covering many different facts about roller coasters.

VISUAL FRACTIONS - http://www.visualfractions.com
Fractions are better understood when they are seen. A page to help identify fractions and mixed numbers, and work with both.  Has an information explaining how to use the page and links to other math sources.

A WALK THROUGH TIME - http://physics.nist.gov/GenInt/Time/time.html
Department of Commerce Publication covers Ancient Calendars, Early Clocks, Timekeeping, The "Atomic Age" and World Time Scales.

WEBMATH - http://www.webmath.com/
An internet based math problem solver, equipped with an online "math-engine" that can instantly provide you with an answer to the particular math problem you may be working on.  Just pick the type of math problem you are working on and you're off.