2 x 1 = ?, 1, 2, 3, 4, 2 x 2 = ?, 2, 3, 4, 5, 2 x 3 = ?, 5, 6, 7, 8, 2 x 4 = ?, 6, 7, 8, 9, 2 x 5 = ?, 8, 9, 10, 11, 2 x 6 = ?, 10, 11, 12, 13, 2 x 7 = ?, 12, 13, 14, 15, 2 x 8 = ?, 14, 15, 16, 17, 2 x 9 = ?, 16, 17, 18, 19, 2 x 10 = ?, 18, 19, 20, 21.

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