Subtract 54/72 from 1/7, Solve 1/7

Subtract 54/72 from 1/7

1/7 - 54/72 is -17/28.

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

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 7 × 72 = 504,
1/7 = 1 × 72/7 × 72 = 72/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
54/72 = 54 × 7/72 × 7 = 378/504
Subtract the two like fractions:
72/504 - 378/504 = 72 - 378/504 = -306/504
After reducing the fraction, the answer is -17/28

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