Subtract 72/18 from 4/7, Solve 4/7 - 4 0/18 as a fraction

Subtract 72/18 from 4/7

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

4/7 - 72/18 is -24/7.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 7 × 18 = 126,
4/7 = 4 × 18/7 × 18 = 72/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
72/18 = 72 × 7/18 × 7 = 504/126
Subtract the two like fractions:
72/126 - 504/126 = 72 - 504/126 = -432/126
After reducing the fraction, the answer is -24/7

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