Subtract 28/7 from 1/72, Solve 1/72

Subtract 28/7 from 1/72

1^st number: 1/72, 2^nd number: 4 0/7

1/72 - 28/7 is -287/72.

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,
1/72 = 1 × 7/72 × 7 = 7/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
28/7 = 28 × 72/7 × 72 = 2016/504
Subtract the two like fractions:
7/504 - 2016/504 = 7 - 2016/504 = -2009/504
After reducing the fraction, the answer is -287/72

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