20 + 30 =, 50, 50 + 40 =, 90, 70 + 20 =, 90, 10 + 80 =, 90, 60 + 30 =, 90, 90 − 20 =, 70, 80 − 50 =, 30, 70 − 30 =, 40, 100 − 40 =, 60, 60 − 10 =, 50.

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