Subtract 36/7 from 54/72, Solve 54/72

Subtract 36/7 from 54/72

1^st number: 54/72, 2^nd number: 5 1/7

54/72 - 36/7 is -123/28.

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,
54/72 = 54 × 7/72 × 7 = 378/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
36/7 = 36 × 72/7 × 72 = 2592/504
Subtract the two like fractions:
378/504 - 2592/504 = 378 - 2592/504 = -2214/504
After reducing the fraction, the answer is -123/28

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