20 - 4 = ?, 14, 17, 16, 15, 18 - 7 = ?, 12, 13, 10, 11, 15 - 6 = ?, 9, 8, 10, 11, 14 - 5 = ?, 7, 9, 10, 8, 13 - 9 = ?, 4, 3, 5, 6, 12 - 8 = ?, 3, 5, 6, 4, 11 - 2 = ?, 8, 7, 9, 10, 9 - 4 = ?, 6, 5, 4, 7, 7 - 3 = ?, 3, 6, 5, 4, 2 - 1 = ?, 1, 0, 3, 2, 19 - 3 = ?, 15, 16, 17, 14, 17 - 5 = ?, 12, 13, 11, 10, 16 - 8 = ?, 7, 6, 8, 9, 10 - 6 = ?, 2, 5, 3, 4, 8 - 2 = ?, 7, 6, 5, 4, 6 - 1 = ?, 5, 6, 3, 4, 5 - 4 = ?, 3, 0, 2, 1, 12 - 3 = ?, 10, 7, 9, 8, 20 - 9 = ?, 10, 11, 9, 12, 14 - 8 = ?, 4, 7, 6, 5.

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