Subtract 30/27 from 70/49, Solve 1 21/49

Subtract 30/27 from 70/49

1^st number: 1 21/49, 2^nd number: 1 3/27

70/49 - 30/27 is 20/63.

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,
70/49 = 70 × 27/49 × 27 = 1890/1323
Likewise, for the 2nd fraction, since 27 × 49 = 1323,
30/27 = 30 × 49/27 × 49 = 1470/1323
Subtract the two like fractions:
1890/1323 - 1470/1323 = 1890 - 1470/1323 = 420/1323
After reducing the fraction, the answer is 20/63

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