Subtract 9/7 from 72/4, Solve 18 0/4

Subtract 9/7 from 72/4

1^st number: 18 0/4, 2^nd number: 1 2/7

72/4 - 9/7 is 117/7.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 7 is 28

Next, find the equivalent fraction of both fractional numbers with denominator 28
For the 1st fraction, since 4 × 7 = 28,
72/4 = 72 × 7/4 × 7 = 504/28
Likewise, for the 2nd fraction, since 7 × 4 = 28,
9/7 = 9 × 4/7 × 4 = 36/28
Subtract the two like fractions:
504/28 - 36/28 = 504 - 36/28 = 468/28
After reducing the fraction, the answer is 117/7
In mixed form: 165/7

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