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

addition - missing numbers

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