Subtract 10/42 from 42/27, Solve 1 15/27

Subtract 10/42 from 42/27

1^st number: 1 15/27, 2^nd number: 10/42

42/27 - 10/42 is 83/63.

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,
42/27 = 42 × 14/27 × 14 = 588/378
Likewise, for the 2nd fraction, since 42 × 9 = 378,
10/42 = 10 × 9/42 × 9 = 90/378
Subtract the two like fractions:
588/378 - 90/378 = 588 - 90/378 = 498/378
After reducing the fraction, the answer is 83/63
In mixed form: 120/63

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad