1 + 1 = - 2, 2 + 2 = - 4, 3 + 3 = - 6, 4 + 4 = - 8, 5 + 5 = - 10, 6 + 6 = - 12, 7+ 7 = - 14, 8 + 8 = - 16, 9 + 9 = - 18, 10 + 10 = - 20,

ADDITION USING DOUBLE NUMBERS

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