7 + ? = 10, 3, 5, 4, ? + 6 = 10, 5, 7, 4, 20 – 13 = ?, 9, 7, 8, 9 + 8 = ?, 17, 15, 16, 15 – 7 = ?, 9, 8, 10, 18 + ? = 20, 5, 4, 2, 16 – ? = 10, 10, 8, 6, 8 + 7 = ?, 15, 14, 13, 14 – 4 = ?, 3, 10, 5, 13 + ? = 20, 7, 8, 9.

Missing Number Challenge

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