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Addition is one of the four basic operations of arithmetic; the others are subtraction, multiplication and division. The addition of two whole numbers is the total amount of those quantities combined. The following addition table is an excellent tool for learning about all of the addition facts from one to twelve.
+ 0 1 2 3 4 5 6 7 8 9 10 11 12 0 0 1 2 3 4 5 6 7 8 9 10 11 12 1 1 2 3 4 5 6 7 8 9 10 11 12 13 2 2 3 4 5 6 7 8 9 10 11 12 13 14 3 3 4 5 6 7 8 9 10 11 12 13 14 15 4 4 5 6 7 8 9 10 11 12 13 14 15 16 5 5 6 7 8 9 10 11 12 13 14 15 16 17 6 6 7 8 9 10 11 12 13 14 15 16 17 18 7 7 8 9 10 11 12 13 14 15 16 17 18 19 8 8 9 10 11 12 13 14 15 16 17 18 19 20 9 9 10 11 12 13 14 15 16 17 18 19 20 21 10 10 11 12 13 14 15 16 17 18 19 20 21 22 11 11 12 13 14 15 16 17 18 19 20 21 22 23 12 12 13 14 15 16 17 18 19 20 21 22 23 24
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"Addition Table" Calculators.net. STANDS4 LLC, 2021. Web. 26 Jan. 2021. <https://www.calculators.net/addition-table/12>.