12 - 8 =?, 5 + 6 = ?, 23 + 39 = ?, 80 + 11 = ?, 44 + 22 = ?, 34 + 13 = ?, 67 - 5 = ?, 43 - 20 = ?, 101 - 31 = ?, 59 + 15 = ?, 10 + 10 = ?, 13 + 30 = ?, 15 + 50 + 5 = ?, 60 - 4 = ?, 10 x 20 = ?, 2, 000/ 4 = ?, 1, 000/10 = ?, 3 x 9 = ?, 90 + 9 =?, 19 + 51 = ?.

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