What number is missing?, 1, 2, 3, 4, What number is missing?, 7, 8, 9, 10, What number is missing?, 2, 3, 4, 5, What number is missing?, 4, 5, 6, 7, What number is missing?, 4, 5, 6, 7, What number is missing?, 1, 2, 3, 4, What number is missing?, 13, 14, 15, 16, What number is missing?, 9, 10, 11, 12, What number is missing?, 7, 8, 9, 10, What number is missing?, 2, 3, 4, 5, What number is missing?, 10, 11, 12, 13, What number is missing?, 11, 12, 13, 14.

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