Subtract 63/7 from 7/72, Solve 7/72

Subtract 63/7 from 7/72

1^st number: 7/72, 2^nd number: 9 0/7

7/72 - 63/7 is -641/72.

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,
7/72 = 7 × 7/72 × 7 = 49/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
63/7 = 63 × 72/7 × 72 = 4536/504
Subtract the two like fractions:
49/504 - 4536/504 = 49 - 4536/504 = -4487/504
After reducing the fraction, the answer is -641/72

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