Subtract 27/7 from 9/72, Solve 9/72

Subtract 27/7 from 9/72

1^st number: 9/72, 2^nd number: 3 6/7

9/72 - 27/7 is -209/56.

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,
9/72 = 9 × 7/72 × 7 = 63/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
27/7 = 27 × 72/7 × 72 = 1944/504
Subtract the two like fractions:
63/504 - 1944/504 = 63 - 1944/504 = -1881/504
After reducing the fraction, the answer is -209/56

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