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  Subcategories   (see also All Sites in this category)
 
 Selected K12 Problem and Puzzle Sites

 By Topic  By Level
  Arithmetic   Elementary
  Algebra     PreK-2
  Geometry     3-5
  Pre-Calculus   Middle School
  Calculus   High School
  Prob/Stat    
  Discrete Math    

There are so many items in this category that we recommend using the keyword search and math topic or grade level menus to narrow down your results.

See also our section of Daily/Weekly/Monthly Challenges.


  All Sites - 1760 items found, showing 1 to 50

  1. 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 ...more>>

  2. $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 ...more>>

  3. $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 ...more>>

  4. 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. ...more>>

  5. 11 Plus Exams - Nick George
    Interactive math tests, with detailed explanations. ...more>>

  6. 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. ...more>>

  7. 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 ...more>>

  8. 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 ...more>>

  9. 12 Times Tables - Debbie Wickens
    Worksheets and online tests for 12 times tables. ...more>>

  10. 1996 Puzzle - Ruth Carver, Math Forum
    For students in grades 3-12 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 ...more>>

  11. 1997 Puzzle - Ruth Carver, Math Forum
    For students in grades 3-12 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 ...more>>

  12. 1998 Puzzle - Judy Brown, Math Forum
    For students in grades 3-12 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 ...more>>

  13. 1999 Puzzle - Judy Brown, Math Forum
    For students in grades 3-12 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 ...more>>

  14. 2000 Puzzle - Judy Brown, Math Forum
    For students in grades 3-12 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 ...more>>

  15. 2001 Puzzle - Judy Brown, Math Forum
    For students in grades 3-12 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 ...more>>

  16. 2002 Puzzle - Judy Brown
    For students in grades 3-12 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 ...more>>

  17. 2003 Puzzle - Judy Brown
    For students in grades 3-12 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 ...more>>

  18. 2004 Mathematics Puzzle - Judy Ann Brown
    For students in grades 3-12 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 ...more>>

  19. 2005 Mathematics Puzzle - Judy Ann Brown
    For students in grades 3-12 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 ...more>>

  20. 2006 Mathematics Puzzle - Judy Ann Brown
    For students in grades 3-12 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 ...more>>

  21. 2007 Mathematics Puzzle - Judy Ann Brown
    For students in grades 3-12 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 ...more>>

  22. 2009 Mathematics Puzzle
    For students in grades 3-12 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 ...more>>

  23. 2010 Mathematics Puzzle
    For students in grades 3-12 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 ...more>>

  24. 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 pre-college ...more>>

  25. 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 highly-focused skill packets with answer keys and level of difficulty for each problem. ...more>>

  26. 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. ...more>>

  27. 30 Second Challenge: The Fun Way to Learn Mathematics - Norman D. Lock
    e-Books (PDF format) that provide an entertaining approach to developing mental arithmetic skills. ...more>>

  28. 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 ...more>>

  29. 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. ...more>>

  30. 65-m.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? ...more>>

  31. 8 Foxes
    A blog in which geometry questions of different levels are posted daily. ...more>>

  32. 9th Grade Math Proficiency Test - NASA Lewis Learning Technologies Project
    9th Grade Math Practice Questions to test addition, multiplication, word-problem skills, and basic algebraic skills. Includes answers and explanations. From the Proficiency Building Activities of the NASA Lewis Research Center K-12 Program. ...more>>

  33. AAA Math - John Banfill
    Online interactive lessons, exercises, practice, and games about basic arithmetic concepts and methods, for grades K-8. Topics include addition, comparing quantities, counting, decimals, division, estimation, factors, fractions, money, multiplication, ...more>>

  34. 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 ...more>>

  35. ABC Home Preschool - Shana Albert
    Resources for homeschoolers, including Preschool Curriculum Workbooks, binders that feature a nine month-long curriculum and "use and reuse" wipe-off pages. ...more>>

  36. 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 Shoot-Out, Fraction Tiles, Tower of ...more>>

  37. 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. ...more>>

  38. 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. ...more>>

  39. ABsurd MAth: Pre-algebra from another dimension - Michael Cain; HRM Video; LearningWave Communications
    An interactive problem-solving 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 ...more>>

  40. Academy123
    From the creators of NutshellMath Homework Help. Pre-recorded mini-lectures and on-demand homework help. Choose a major math textbook for tailored Flash chalkboard demonstrations that feature color ink strokes accompanied by a teacher's voice. Covered ...more>>

  41. 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? ...more>>

  42. Acertijolandia - Jose Manuel Galvan Pachon
    Math problems, riddles, and brain teasers for all ages. In Spanish. ...more>>

  43. A+ Click K-12 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. ...more>>

  44. 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 ...more>>

  45. Active Elementary Number Theory: n2 + 1 and coprime increasing pairs of different parity - H. B. Meyer
    An interactive study of coprime increasing number-pairs of different parity and their relations to divisors of n2 + 1. Requires JavaScript. ...more>>

  46. 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 ...more>>

  47. 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 ...more>>

  48. AdaptedMind - Kumar Kota
    AdaptedMind uses adaptive technologies closely tied with videos, explanations, and prizes to help K-6 students practice math more effectively. Free worksheets, custom exercises, and skills pretest. ...more>>

  49. 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. ...more>>

  50. Addition and Multiplication Tables in Various Bases - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    An applet that combines addition and multiplication tables for bases from 2 through 36. In every base N, there are N digits. In the decimal system, for example, we have 10 of them: 0,1,2,3,4,5,6,7,8,9. In base 7, there are seven digits: 0,1,2,3,4,5,6. ...more>>


 
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