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How do you do number 38 to 40 please help

How do you do number 38 to 40 please help-example-1

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38. Division by 1/3 is the same as multiplication by 3.


(5)/(6) * 3 = 5 * (3)/(6) = 5 * (1)/(2) = (5)/(2)


(1)/(2) * 3 = (3)/(2)


(1)/(9) * 3 = (3)/(9) = (1)/(3)


40. Division by 1/2 is the same as multiplication by 2.


x * 2 = (6)/(8)

x = (6)/(8) * (1)/(2) = (3)/(8)


3 * 2 = 6


x * 2 = 5

x = (5)/(2)
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