Subtract 9/4 from 72/15, Solve 4 12/15

Subtract 9/4 from 72/15

1^st number: 4 12/15, 2^nd number: 2 1/4

72/15 - 9/4 is 51/20.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 4 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 15 × 4 = 60,
72/15 = 72 × 4/15 × 4 = 288/60
Likewise, for the 2nd fraction, since 4 × 15 = 60,
9/4 = 9 × 15/4 × 15 = 135/60
Subtract the two like fractions:
288/60 - 135/60 = 288 - 135/60 = 153/60
After reducing the fraction, the answer is 51/20
In mixed form: 211/20

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