Subtract 12/72 from 72/63, Solve 1 9/63

Subtract 12/72 from 72/63

1^st number: 1 9/63, 2^nd number: 12/72

72/63 - 12/72 is 41/42.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 72 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 63 × 8 = 504,
72/63 = 72 × 8/63 × 8 = 576/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504
Subtract the two like fractions:
576/504 - 84/504 = 576 - 84/504 = 492/504
After reducing the fraction, the answer is 41/42

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