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2. Fairchild Channel F - Wikipedia

   en.wikipedia.org/wiki/Fairchild_Channel_F

   Videocart-6: Math Quiz I (Addition & Subtraction) 1977 Educational Videocart-7: Math Quiz II (Multiplication & Division) 1977 Educational Videocart-8: Magic Numbers (Mind Reader & Nim) 1977 Trivia Videocart-9: Drag Race: 1977 Racing Videocart-10: Maze, Jailbreak, Blind-Man's-Bluff, Trailblazer: 1977 Maze Videocart-11: Backgammon, Acey-Deucey ...

3. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Subtraction is an operation that represents removal of objects from a collection. [ 1 ] For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3.

4. 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]

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. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   In accounting, a worksheet is, or was, a sheet of ruled paper with rows and columns on which an accountant could record information or perform calculations. These are often called columnar pads, and typically green-tinted. In computing, spreadsheet software presents, on a computer monitor, a user interface that resembles one or more paper ...

7. Duolingo - Wikipedia

   en.wikipedia.org/wiki/Duolingo

   Duolingo Math is an app course for learning elementary mathematics. It was announced on YouTube on August 27, 2022, at the Duocon 2022 event. [80] Duolingo Math covers math topics through an interactive and gradual approach. It starts with basic arithmetic—addition, subtraction, multiplication, and division.