Subtract 21/27 from 30/49, Solve 30/49

Subtract 21/27 from 30/49

30/49 - 21/27 is -73/441.

Find the least common denominator or LCM of the two denominators:
LCM of 49 and 27 is 1323

Next, find the equivalent fraction of both fractional numbers with denominator 1323
For the 1st fraction, since 49 × 27 = 1323,
30/49 = 30 × 27/49 × 27 = 810/1323
Likewise, for the 2nd fraction, since 27 × 49 = 1323,
21/27 = 21 × 49/27 × 49 = 1029/1323
Subtract the two like fractions:
810/1323 - 1029/1323 = 810 - 1029/1323 = -219/1323
After reducing the fraction, the answer is -73/441

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