3 3/4 * 3 2/5 = 15/4 * 17/5 = 255/20 = 12.75 = 12 3/4
12 and 3 quarters
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4 fifths
18
five-eights is one-eigtht larger than one-half...which, after converting to a common denominator, is four-eights.
2/5 of 45 = 18
It is 10 so that 2/5 + 1/2 becomes 4/10 + 5/10 = 9/10