30 - 20 + 10 =, 40 - 50 -10=, 50 - 60-10=, 60 - 70 - 10 =, 100 - 90 + 10=, 10 - 20 - 10 =, 35 - 30 + 5 =, 49 - 40 + 9 =, 70 - 80 - 10 =, 80 - 90 - 10 =, 95 - 90 + 5=, 38 - 30 + 8 =, 76 - 70 + 6 =, 54 - 50 + 4 =,

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