0 - ? + 4 = 4, 15 - 5 + ? = 20, 7 - 2 + ? = 9, 6 - 4 + ? = 10, 1 - 14 + ? = 15, 8 - 4 + ? = 12, 4 - ? + 10 = 14, 5 - ? + 1 = 6, 11 - ? + 6 = 17, 2 - ? + 5 = 7, 10 - 10 + ? = 20, 14 - 1 + ? = 15, 3 - ? + 3 = 6, 12 - ? + 2 = 14, 9 - 9 + ? = 18,

Missing Number Addition (Landon)

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