1 + ? = 10 - 9, 2 + ? = 10 - 8, 3 + ? = 10 - 7, 4 + ? = 10 - 6, 5 + ? = 10 - 5, 6 + ? = 10 - 4, 7 + ? = 10 - 3, 8 + ? = 10 - 2, 9 + ? = 10 - 1, 10 + ? = 10 - 0, 10 - 0 = - 10, 10 - 1 = - 9, 10 - 2 = - 8, 10 - 3 = - 7, 10 - 4 = - 6, 10 - 5 = - 5, 10 - 6 = - 4, 10 - 7 = - 3, 10 - 8 = - 2, 10 - 9 = - 1, 10 - 10 = - 0,

Adding and Subtracting Within 10

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