Subtract 10/42 from 30/27, Solve 1 3/27

Subtract 10/42 from 30/27

1^st number: 1 3/27, 2^nd number: 10/42

30/27 - 10/42 is 55/63.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 42 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 27 × 14 = 378,
30/27 = 30 × 14/27 × 14 = 420/378
Likewise, for the 2nd fraction, since 42 × 9 = 378,
10/42 = 10 × 9/42 × 9 = 90/378
Subtract the two like fractions:
420/378 - 90/378 = 420 - 90/378 = 330/378
After reducing the fraction, the answer is 55/63

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