Divide 45 by 5 (giving you 9), then multiply that by 2 to get the answer 18.
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5/9 times 2/5 = 10/45 or 2/9 in its simplest form
one fifth of 45 is:1/5 x 45 = 45/5= 45 ÷ 5= 9
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Finding one fifth of a number is the same as multiplying the number by 1/5, or 0.2. In this instance, 45 x 0.2 = 9.