7 + 3 = ?, 20, 12, 40, 10, 11 + 9 = ?, 12, 2, 20, 8, 30 - 10 = ?, 2, 50, 40, 8, 14 + 16 = ?, 8, 14, 30, 20, 22 + 18 = ?, 40, 50, 18, 8, 2 × 5 = ?, 2, 10, 12, 20, 2x7= ?, 14, 12, 50, 20, 2x1= ?, 20, 2, 50, 10, 2x9= ?, 20, 18, 50, 30, 2x10= ?, 12, 20, 18, 8, 10 × 5 = ?, 50, 40, 20, 30, 45 - 15 = ?, 15, 20, 30, 40, 45 + 5 = ?, 20, 30, 15, 50.

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