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2. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Elementary arithmetic is a branch of mathematics involving addition, subtraction, multiplication, and division. Due to its low level of abstraction, broad range of application, and position as the foundation of all mathematics, elementary arithmetic is generally the first branch of mathematics taught in schools. [1][2]

3. Make 10: A Journey of Numbers - Wikipedia

   en.wikipedia.org/wiki/Make_10:_A_Journey_of_Numbers

   Make 10: A Journey of Numbers (タシテン たして10にする物語, Tashiten: Tashite 10 ni Suru Monogatari) is a puzzle and logic adventure game developed by MuuMuu and published by Nintendo for the Nintendo DS. Make 10 focuses on maths games, mostly revolving around adding or subtracting in order to make the number 10. It was released in ...

4. Keisan Game - Wikipedia

   en.wikipedia.org/wiki/Keisan_Game

   Sansū 4-nen: Keisan Game (けいさんゲーム 算数4年 ＋−×÷, "Calculation Game: Arithmetic for Fourth Graders") is a Family Computer educational video game that was released on October 30, 1986. This video game is an educational game teaching four basic principles: division, adding/subtracting decimals, adding/subtracting fractions ...

5. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   Addition (usually signified by the plus symbol +) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication and division. [2] The addition of two whole numbers results in the total amount or sum of those values combined. The example in the adjacent image shows two columns of three apples and two apples ...

6. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

7. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   Order of operations. In mathematics and computer programming, the order of operations is a collection of rules that reflect conventions about which operations to perform first in order to evaluate a given mathematical expression. These rules are formalized with a ranking of the operations. The rank of an operation is called its precedence, and ...