5 - ? + 1 = 6, 11 - 2 + ? = 13, 2 - 1 + ? = 3, 7 - ? + 1 = 8, 3 - 16 + ? = 19, 1 - ? + 1 = 2, 4 - ? + 16 = 20, 9 - ? + 4 = 13, 0 - 5 + ? = 5, 6 - ? + 1 = 7, 8 - ? + 6 = 14, 12 - ? + 3 = 15, 10 - ? + 1 = 11, 15 - ? + 5 = 20, 13 - 5 + ? = 18,

Addition up to 20 - missing number

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