10 + 30 = ?, 50, 60, 30, 40, 20 + 30 = ?, 50, 40, 60, 30, 40 − 10 = ?, 30, 20, 50, 40, 50 − 20 = ?, 20, 40, 10, 30, 10 + 20 + 10 = ?, 50, 40, 20, 30, 30 + 20 − 10 = ?, 30, 50, 60, 40, 60 − 20 + 10 = ?, 40, 30, 50, 60, 70 − 30 + 10 = ?, 60, 50, 40, 30, 20 + 20 + 10 = ?, 30, 50, 40, 60, 80 − 40 + 20 = ?, 50, 40, 60, 70, 90 − 30 − 20 = ?, 60, 50, 40, 30, 40 + 30 − 20 = ?, 40, 60, 70, 50, 50 − 10 + 30 = ?, 50, 80, 70, 60, 80 − 20 − 30 = ?, 30, 50, 40, 20, 30 + 40 − 10 = ?, 60, 80, 50, 70, 90 − 40 + 10 = ?, 50, 40, 70, 60, 20 + 50 − 30 = ?, 60, 30, 40, 50, 70 − 20 − 10 = ?, 40, 50, 30, 60, 40 + 40 − 30 = ?, 50, 60, 40, 30, 60 − 10 + 20 = ?, 80, 50, 60, 70

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