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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