Subtract 21/7 from 5/72, Solve 5/72

Subtract 21/7 from 5/72

1^st number: 5/72, 2^nd number: 3 0/7

5/72 - 21/7 is -211/72.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 7 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
5/72 = 5 × 7/72 × 7 = 35/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
21/7 = 21 × 72/7 × 72 = 1512/504
Subtract the two like fractions:
35/504 - 1512/504 = 35 - 1512/504 = -1477/504
After reducing the fraction, the answer is -211/72

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