a) 4 × 10 = 40, 40 × 2 = 80, 280 - 80 = 200, 200 : 4 = 50
b) 10 × 3 = 30, 30 × 2 = 60, 280 - 60 = 220, 220 : 10 = 22
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a) 4 × 10 = 40, 40 × 2 = 80, 280 - 80 = 200, 200 : 4 = 50
b) 10 × 3 = 30, 30 × 2 = 60, 280 - 60 = 220, 220 : 10 = 22