inverse operations : 4 x 4 = 16, 16 ÷ 4 = 4, 4 x 4 = 16, 2 x 2 = 4, inverse operations :2 x 10 = 20, 10 x 3 = 30, 10 ÷ 2 = 5, 20 ÷ 2 = 10, inverse operations 25 ÷ 5 = 5, 5 x 4 = 20, 5 x 5 = 20, 5 x 10 = 30, inverse operations 15 ÷ 3 = 5, 3 x 5 = 15, 5 x5 = 25, 3 x3 = 9, inverse operations 36 ÷ 4 = 9, 9 x 4 = 38, 9 x 4 = 50, 9 x 4 = 36

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