 0h h1  Martin Kool
A "little logic game" related to Takuzu and Binario: complete grids of 4 × 4, 6 × 6, 8 × 8, or 10 × 10 so that all rows and columns have an equal number of each color, but none has three adjacent tiles of the same color or shares the
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 $1000 High School Calculus Student Award (Math Chat)  Frank Morgan, MAA Online
Solution to the challenge: Justin Smith calls 5939 a "right" prime because it remains prime after dropping any number of digits from the right: 5939, 593, 59, and 5 are all prime. How many right primes are there less than 1000? Is there a largest right
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 $1000 Math Chat Book Quest (Math Chat)  Frank Morgan, MAA Online
Solution to the challenge: On a beach in Oregon, at a certain moment, the very last bit of the Sun disappears below the horizon. The question is: Can I make that last bit of Sun reappear by jumping up quickly to my full height, or perhaps by very quickly
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 10ticks.co.uk  Fisher Educational Ltd
Games, puzzles, and help aimed at the National Numeracy Strategy of the United Kingdom. National Curriculum Compliant maths worksheets for teachers. Registration required.
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 11 Plus Exams  Nick George
Interactive math tests, with detailed explanations.
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 1234 Altizer Mathematics  Sarah Altizer
Over 2000 worksheets covering computations from addition to sums of 18 through determining what percentage one number is of another. All are in .pdf format and have answer keys.
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 125 Questions: What Don't We Know?  Science Magazine
Science celebrated its 125th anniversary with a look forward at the most compelling puzzles and questions facing scientists today. Accompanied by reader's forums and other online extras, this free news feature explores 125 big questions that face scientific
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 12 coins problem  Frans Faase
A classic math puzzle: given a balance scale and 12 coins, one of which is counterfeit and weighs less or more than the other coins, determine the counterfeit in 3 weightings, and tell if it is heavier or lighter. Extensions to other cases and the general
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 12 Times Tables  Debbie Wickens
Worksheets and online tests for 12 times tables.
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 1996 Puzzle  Ruth Carver, Math Forum
For students in grades 312 with a general knowledge of mathematics. Using the digits in 1996 and any operations, try to write equations that have the numbers from 0 to 100 as the answer. The answer for each number and the name of the first person to
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 1997 Puzzle  Ruth Carver, Math Forum
For students in grades 312 with a general knowledge of mathematics. Using the digits in 1997 and any operations, try to write equations that have the numbers from 0 to 100 as the answer. The answer for each number and the name of the first person to
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 1998 Puzzle  Judy Brown, Math Forum
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 1998 and the operations +, , x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for
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 1999 Puzzle  Judy Brown, Math Forum
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 1999 and the operations +, , x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for
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 2000 Puzzle  Judy Brown, Math Forum
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2000 and the operations +, , x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for
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 2001 Puzzle  Judy Brown, Math Forum
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2001 and the operations +, , x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for
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 2002 Puzzle  Judy Brown
For students in grades 312 with a general knowledge of mathematics. Use the
digits in the year 2002 and the operations +, , x, ÷, sqrt (square root), ^
(raise to a power), and ! (factorial), along with grouping symbols, to write
expressions for
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 2003 Puzzle  Judy Brown
For students in grades 312 with a general knowledge of mathematics. Use the
digits in the year 2003 and the operations +, , x, ÷, sqrt (square root), ^
(raise to a power), and ! (factorial), along with grouping symbols, to write
expressions for
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 2004 Mathematics Puzzle  Judy Ann Brown
For students in grades 312 with a general knowledge of mathematics. Use the
digits in the year 2004 and the operations +, , x, ÷, sqrt (square root), ^
(raise to a power), and ! (factorial), along with grouping symbols, to write
expressions for
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 2005 Mathematics Puzzle  Judy Ann Brown
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2005 and the operations +, , x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for the
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 2006 Mathematics Puzzle  Judy Ann Brown
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2006 and the operations +, , x, ÷, ^ (raised to a power), sqrt (square root), and ! (factorial), along with grouping symbols, to write expressions for the
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 2007 Mathematics Puzzle  Judy Ann Brown
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2007 and the operations +, , x, ÷, ^ (raised to a power), sqrt (square root), and ! (factorial), along with grouping symbols, to write expressions for the
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 2009 Mathematics Puzzle
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2009 and the operations +, , x, ÷, ^ (raised to a power), sqrt (square root), and ! (factorial), along with grouping symbols, to write expressions for the
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 2010 Mathematics Puzzle
For students in grades 312 with a general knowledge of mathematics. Use the digits in the year 2010 and the operations +, , x, ÷, ^ (raised to a power), sqrt (square root), and ! (factorial), along with grouping symbols, to write expressions for the
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 21st Century Problem Solving  Howard C. McAllister
Examples of problems solved using reliable problem solving methods; discussion of the principles of reliable problem solving; a FAQ; and an evolving encyclopedia of solved problems in mathematics, physics, and chemistry. The main focus is on precollege
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 24HourAnswers.com, Inc.  24HourAnswers.com, Inc.
Emailed answers to questions and homework problems, online tutoring, and a section of free SAT math prep packets: 30 highlyfocused skill packets with answer keys and level of difficulty for each problem.
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 30 Days of Problems for 30 Years of High School Math Competitions  Anne Arundel Community College
Thirty problems and their answers from high school math competitions held at Anne Arundel Community College during the past 30 years.
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 30 Second Challenge: The Fun Way to Learn Mathematics  Norman D. Lock
eBooks (PDF format) that provide an entertaining approach to developing mental arithmetic skills.
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 3Blue1Brown  Grant Sanderson
Video explanations that elucidate with computer animations, changes in perspective, humor, and — occasionally — rhyming voiceover: Euler's formula, circle division (disjoint regions obtained by joining n points around a circle), and complex
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 42nd International Mathematical Olympiad: Math Expands Horizons  Dr. Walter E. Mientka, Executive Director
This event brings to the USA 500 of the most talented high school age mathematicians from more than 80 countries. Washington, DC, hosts the Olympiad, with opening ceremonies on July 4, 2001. The American mathematics community uses this opportunity to
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 5 x 5 Magic Squares  H. B. Meyer
An interactive page dedicated to the construction of 5 x 5 magic squares. You may move the numbers manually, watch the computer slowly create a magic square, or have the computer quickly generate a magic square. Requires JavaScript.
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 65m.p.h. Speed Limits, Large Primes, and Japanese Exams (Math Chat)  Frank Morgan; Christian Science Monitor
When a state increases a highway speed limit from 55 to 65 miles per hour, by what percent does the road capacity (in cars per hour) change?
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 8 Foxes
A blog in which geometry questions of different levels are posted daily.
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 9th Grade Math Proficiency Test  NASA Lewis Learning Technologies Project
9th Grade Math Practice Questions to test addition, multiplication, wordproblem skills, and basic algebraic skills. Includes answers and explanations. From the Proficiency Building Activities of the NASA Lewis Research Center K12 Program.
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 AAA Math  John Banfill
Online interactive lessons, exercises, practice, and games about basic arithmetic concepts and methods, for grades K8. Topics include addition, comparing quantities, counting, decimals, division, estimation, factors, fractions, money, multiplication,
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 The Abacus: The Art of Calculating with Beads  Luis Fernandes
A tutorial on using the abacus  a calculator whose earliest known use is circa 500 B.C. by the Chinese civilization. Addition, subtraction, division and multiplication can be performed on a standard abacus. Beginning in about 1600 A.D., use and evolution
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 ABC Home Preschool  Shana Albert
Resources for homeschoolers, including Preschool Curriculum Workbooks, binders that feature a nine monthlong curriculum and "use and reuse" wipeoff pages.
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 ABCya.com  ABCya.com, L.L.C.
Free educational math games that introduce basic computer skills: Geometry Practice, Addition with Manipulatives, Subtraction Match Game, Math Facts Basketball, Interactive 100 Number Chart, Math Bingo, Place Value ShootOut, Fraction Tiles, Tower of
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 About Rubik's Cube  Dan Knights
See the author's collection of Rubik's cubes, his solution and timing methods, thoughts on solving Rubik's Cube with your eyes closed, and suggestions for lubricating your cube and where to get them.
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 abraCAdaBRI  Yves Martin
Liens et exercises pour le logiciel Cabri Géomètre:
geéométries; affine plane; vectorielle plane; affine de l'espace; non euclidennes; logique (Alice); dossier coniques; pratique de Cabri. In French.
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 ABsurd MAth: Prealgebra from another dimension  Michael Cain; HRM Video; LearningWave Communications
An interactive problemsolving game series where the ultimate power consists of mathematical skill and knowledge. Many pages have hidden clues and areas; when players need help, they may email the staff for assistance. Teachers and parents may request
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 Academy123
From the creators of NutshellMath Homework Help. Prerecorded minilectures and ondemand homework help. Choose a major math textbook for tailored Flash chalkboard demonstrations that feature color ink strokes accompanied by a teacher's voice. Covered
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 Accurate Census Taking and Orderly Ants (Math Chat)  Frank Morgan; Christian Science Monitor
A column of ants marches in single file, until one ant falls away and they then march two by two, until another ant falls away and they then march three by three, and so on until finally they are marching 10 by 10. How many ants were there to start with?
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 Acertijolandia  Jose Manuel Galvan Pachon
Math problems, riddles, and brain teasers for all ages. In Spanish.
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 A+ Click K12 Math Quiz
A+ Click is a free online math quiz. Assess your math skills from grade 1 to grade 12; you may move up a level if you give 5 correct answers in a row. Also available in Russian.
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 Active Algebra  David Womersley, Active Maths Limited
Interactive resources designed to enhance and enrich the teaching and learning of algebra. Free trial version available online; buy the CD and get a password which will remove the evaluation logo from those versions. All the activities can be used either
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 Active Elementary Number Theory: n^{2} + 1 and coprime increasing pairs of different parity  H. B. Meyer
An interactive study of coprime increasing numberpairs of different parity and their relations to divisors of n2 + 1. Requires JavaScript.
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 Active Worksheets  David Womersley, Active Maths Limited
Formerly known as the Worksheet Factory, you can create worksheets online for an annual subscription fee: click on the "change" button and watch the numbers, angles, shapes or equations change; click on the "print" button to print a pupil worksheet and
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 Adam Up  Summerfield, James; Kordan, Samuel
Original music, chants, and other oral mnemonics that tell the adventures of Adam Up, who hated maths "... until the day his grandfather gave him a special calculator to summon The Number Crunchers. These strange bearded creatures then sing him catchy
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 AdaptedMind  Kumar Kota
AdaptedMind uses adaptive technologies closely tied with videos, explanations, and prizes to help K6 students practice math more effectively. Free worksheets, custom exercises, and skills pretest.
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 Adding Feet and Inches  NASA Lewis Learning Technologies Project
If Sally places a 3 feet 6 inch tall rocket atop a 1 foot 8 inch tall launch pad, how tall will the entire unit (rocket and launch pad) be when she is done? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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