addition, What's arithmetic operation is this? 1+1=2, subtraction, What's arithmetic operation is this? 5-5=0, odd, 13, 15, 1, 17 are.....................numbers, even, 12, 20, 100, 4, 8 are..............numbers, single-digit, What do you call numbers from 0 to 9?, double-digit, 20, 55, 33, 80, 77 - what kind of numbers are these?, row, a horizontal line of things, words, or numbers, column, a vertical line of things, words, or numbers, equals, What's missing here? 8+12 20, sign, plus or minus.....

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