Subtract 36/7 from 81/72, Solve 1 9/72

Subtract 36/7 from 81/72

1^st number: 1 9/72, 2^nd number: 5 1/7

81/72 - 36/7 is -225/56.

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,
81/72 = 81 × 7/72 × 7 = 567/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
36/7 = 36 × 72/7 × 72 = 2592/504
Subtract the two like fractions:
567/504 - 2592/504 = 567 - 2592/504 = -2025/504
After reducing the fraction, the answer is -225/56

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