0 - 1 + ? = 1, 3 - ? + 7 = 10, 4 - ? + 2 = 6, 1 - ? + 3 = 4, 6 - 5 + ? = 11, 14 - ? + 5 = 19, 15 - 3 + ? = 18, 2 - 13 + ? = 15, 11 - 5 + ? = 16, 10 - 3 + ? = 13,

Clements W2D1 Addition up to 20 Missing Number

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