Subtract 8/24 from 27/21, Solve 1 6/21

Subtract 8/24 from 27/21

1^st number: 1 6/21, 2^nd number: 8/24

27/21 - 8/24 is 20/21.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 24 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 21 × 8 = 168,
27/21 = 27 × 8/21 × 8 = 216/168
Likewise, for the 2nd fraction, since 24 × 7 = 168,
8/24 = 8 × 7/24 × 7 = 56/168
Subtract the two like fractions:
216/168 - 56/168 = 216 - 56/168 = 160/168
After reducing the fraction, the answer is 20/21

MathStep (Works offline)

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