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Home : Math Topics : Arithmetic/Early : Basic Operations : Subtraction

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  Selected Sites   (see also All Sites in this category)

  1. An Investigation of Subtraction Algorithms from the 18th and 19th Centuries - Nicole M. Wessman-Enzinger
    An exploration of different algorithms used during 18th and 19th century America, with discussion of implications for the modern teacher. This article, which originally appeared in the January 2014 issue of the Mathematical Association of America (MAA) journal Convergence, includes images from printing press textbooks and handwritten "cyphering" books that date back to 1785, and video demonstrations of the equal additions, the decomposition, the complement, and the Austrian methods for figuring the difference between two whole numbers. more>>


 
  All Sites - 33 items found, showing 1 to 33

  1. Adding Integers (SMILE) - John Charles Thomas, N. F. Simeon Vocational High School
    A lesson designed to teach students to add and subtract integers, and define terms (additive inverse, identity element of addition, associative property of addition, addend, sum, magnitude). From the Arithmetic section of a collection of almost 200 single ...more>>

  2. Adding/Subtracting Fractions - Math Forum, Ask Dr. Math Common Question
    A selection of answers to questions about adding and subtracting fractions, including how to find common denominators. ...more>>

  3. Add It Up - CleverMedia
    Combine tiles that sum to the target number. Earn extra points for combining more tiles or consuming less time; win a bonus for using up all the tiles; lose points points for every tile left on the board. Requires the Flash plug-in. ...more>>

  4. All About Subtraction (AAA Math) - John Banfill
    Free, interactive math exercises, lessons, and games covering beginning subtraction facts and subtraction of whole numbers, decimals, and fractions. ...more>>

  5. Big Daddy's Freeware - Vincent DiCarlo
    Small, simple DOS programs to download for effective drilling of basic addition, subtraction, and multiplication. ...more>>

  6. Borrowing/Regrouping - Math Forum, Ask Dr. Math Common Question
    A selection of answers to questions about borrowing, regrouping, and carrying, such as "When doing subtraction problems like 100-99, why do the zeros become nines?" and "When you are subtracting a fraction, do you always take one away from the whole number?" ...more>>

  7. Counting and Place Value (SMILE) - Carole Gills, Edward Coles School
    A lesson for grade 1 designed to give first grade students a concrete understanding of place value by providing concrete opportunities to practice counting, adding, and subtracting, using a phenomenological approach. From the Arithmetic section of a collection ...more>>

  8. Division by Three [PDF] - John Conway, Peter Doyle
    A formal proof that it is possible to divide by three. This assertion is easy to prove using the axiom of choice, but becomes a much more difficult problem if the axiom of choice is not allowed (as is the case here). From this proof, and the much simpler ...more>>

  9. Dositey.com - Dositey Corporation
    Interactive lessons, exercises and worksheets, educational games, open-ended questions in Math and Language Arts, and more. ...more>>

  10. Equate: The Equation Thinking Game - Conceptual Math Media, Inc.
    Have fun creating equations crossword-style. An arithmetic version of Scrabble, Equate is a math board game for family and classroom. Earn higher scores by using division or fraction tiles, or by playing tiles on premium board positions that double or ...more>>

  11. A Fictional History of Place Value (SMILE) - Bette B. Jarrow, Goudy Elementary School
    A lesson designed to teach students to rename a two- or three-digit number in several different ways, including expanded form; and to perform addition and subtraction with the application of regrouping and the use of zero as a place holder. From the Arithmetic ...more>>

  12. Flash Cards for Kids - Donovan Follette
    Currently, Flash Cards (shareware for Windows) supports addition, subtraction, and multiplication. The addition facts are enabled in the download file. The subtraction and multiplication facts can be enabled with a registration fee of $12.00. (Washington ...more>>

  13. GoKidding - Sarveshwar Rao
    Flash activities on counting, adding, subtracting, and naming shapes (polygons). Worksheets include circle mazes, fun with circles, and fun with triangles. ...more>>

  14. Javascript School Math Toolkit - Jeff LeMieux
    JavaScript Pythagorean solver, proportion problem solver, percent proportion problem solver, chord to circumference calculator, denominator to repeating decimal checker, subtraction worksheet generator, addition worksheet generator, multiplication worksheet ...more>>

  15. Kids SyvumBook Series - Syvum Technologies, Inc.
    Interactive educational software for English, Knowledge, and Math, targeted for kids ages 6-12. Each Kids SyvumBook offers multimedia strips and main activity frames. Four levels of Math SyvumBooks help improve arithmetic, algebra, and basic number skills ...more>>

  16. The Lighter Side of Dr. Paulsen - William Paulsen
    A collection of online games and puzzles: blackjack, The Non-Zero Difference Game, No Alibi (a mystery detective game), a haunted mansion labyrinth, sliding tile puzzles, and The Prime Maze. ...more>>

  17. MATH DITTOS 2 (Arithmetic Software) - Wood
    The MATH DITTOS 2 series is a fact-supported approach to teaching computation designed for special learners by a career elementary schoolteacher. Each page in the series presents a limited number of problems with some workspace. The facts necessary to ...more>>

  18. Math Fun and Educational Gifts and Specials - 24Hours7Days
    Purchase Clever Catch Balls, Fraction Bars, Decimal Squares, Math Chase, and other board games and manipulatives for practicing addition, algebra, decimals, division, fractions, money, multiplication, patterns, subtraction, and time. ...more>>

  19. Math Game Using A Tic-Tac-Toe Board (SMILE) - Gertrude Franklin, William Penn
    A lesson for the elementary grades that introduces addition, subtraction and multiplication by using Tic-Tac-Toe methodology; introduces a new method in using the Tic-Tac-Toe grid; and presents a new problem-solving method. From the Recreational and ...more>>

  20. Math Is Power Math Puzzles - National Action Council for Minorities in Engineering (NACME)
    Six Shockwave games. CodeBreaker requires using trial and error to deduce the correct string of colored circles, given feedback on position and quantity. In Space Tag, two players take turns moving on a grid, one of them attempting to occupy the other's ...more>>

  21. MathMastery - MathMastery.com
    Play CyberChallenge Shockwave addition, subtraction, multiplication, and division games. Test Your Skills with placement exams (online or printable) on adding, subtracting, multiplying, dividing, fractions, and decimals. My Math Class offers Shockwave ...more>>

  22. Math - PrimaryGames.com
    Games and drills for very young students: Two Minute Warning (drills addition and subtraction); One Little Ball (numbers 1-5); Sammy's Shapes (geometric shapes); Take It Away (subtraction); Add 'em Up (addition). ...more>>

  23. Measuring with Two Containers - Math Forum, Ask Dr. Math Common Question
    A selection of answers to questions about using two different containers to measure out a third quantity, such as "How can you measure 7 liters using only 4-liter and 9-liter pails?" ...more>>

  24. Money: Demonstrating Coin Values up to $1.00 (SMILE) - Camille Gales, Coles Elementary School
    A lesson designed to teach students to use a variety of coins to make change up to the value of a dollar. From the Arithmetic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement. ...more>>

  25. Music through the Curriculum - Phil Tulga
    Developers of math programs such as "Math and Music," which teaches students how to "hear" math (what does a fraction sound like? how about a shape?); and "Math, Science and Sound," an assembly and family night program that connects thunder, volcanoes, ...more>>

  26. My Rummy - My-Rummy.com
    A math card game designed to help math teachers develop their students' number sense and understanding of addition and subtraction, and also to promote reading, listening and quick decision making among the players. ...more>>

  27. NewMedia Project: Integers - MathStar, Los Angeles County Office of Education
    The NewMedia Project area of MathStar offers resources in mathematics for middle school teachers and students. The Integers unit is comprised of three lessons: Introducing Integers, Adding/Multiplying Integers, and Subtracting Integers. Each of the three ...more>>

  28. A 'New Set of Numbers' (An Introduction of Integers) (SMILE) - Barbara Barlow, Caldwell School
    A lesson for grade 6 designed to teach students to add and subtract positive and negative integers. From the Arithmetic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement. ...more>>

  29. Numberline Lane - Fiona Cartmell, Nick Reynolds, and Anthony Cartmell
    A website accompanying books designed to help teaching and learning math through stories and cartoon illustrations. Meet the residents of Numberline Lane: Walter One, Suzie Two, Hebe Three, Nora Four, Clive Five, Nick Six, Kevin Seven, Katy Eight, Nigel ...more>>

  30. Primary Understanding and Use of Place Value (SMILE) - Eleanor Brzozowski, Hanson Park School
    A lesson designed to teach students about some of the peoples that have contributed to the development of modern arithmetic (number systems); to provide a better understanding of our base 10 number system and its application to real life problems; and ...more>>

  31. Roman-Numerals.org - John Barth
    Lessons, worksheets, online games, and quizzes for practicing Roman numeral counting and arithmetic. ...more>>

  32. TouchMath: Multi-sensory Math Supplements - Innovative Learning Concepts, Inc.
    The TouchMath Method is a multi-sensory approach to teaching basic number concepts, addition, subtraction, multiplication and division. TouchMath integrates digits 1 through 9 with a corresponding number of "touchpoints." Students physically touch each ...more>>

  33. Whole Language Approach in Solving Word Problems (SMILE) - Barbara Thomas, Langston Hughes School
    A lesson that uses the story of the Three Little Pigs to teach students to formulate addition and subtraction problems of whole numbers; relate everyday language to mathematics meaningfully; use problem-solving approaches to investigate and understand ...more>>


 
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