1, 2, 3, 4, ?, 5, 6, 5, 6, 7, 8, ?, 9, 10, 10, 11, 12, 13, ?, 14, 15, 1, 3, 5, 7, ?, 9, 8, 2, 4, 6, 8, ?, 10, 9, 3, 5, 7, 9, ?, 11, 10, 4, 6, 8, 10, ?, 12, 11, 5, 7, 9, 11, ?, 13, 12, 6, 8, 10, 12, ?, 14, 13, 7, 9, 11, 13, ?, 15, 14, 13,12,11,10, ?, 9, 8, 7, 6, 8,7,6,5,?, 3, 2, 4, 5, 8,6,4,?, 2, 3, 1, 4, 9,8,7,?, 6, 11, 9, 8, 10,8,6,?, 10, 9, 4, 7

Basic Subtraction Quiz

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