Subtract 80/8 from 14/21, Solve 14/21

Subtract 80/8 from 14/21

1^st number: 14/21, 2^nd number: 10 0/8

14/21 - 80/8 is -28/3.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 21 × 8 = 168,
14/21 = 14 × 8/21 × 8 = 112/168
Likewise, for the 2nd fraction, since 8 × 21 = 168,
80/8 = 80 × 21/8 × 21 = 1680/168
Subtract the two like fractions:
112/168 - 1680/168 = 112 - 1680/168 = -1568/168
After reducing the fraction, the answer is -28/3

MathStep (Works offline)

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