Subtract 21/12 from 80/35, Solve 2 10/35

Subtract 21/12 from 80/35

1^st number: 2 10/35, 2^nd number: 1 9/12

80/35 - 21/12 is 15/28.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 12 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 35 × 12 = 420,
80/35 = 80 × 12/35 × 12 = 960/420
Likewise, for the 2nd fraction, since 12 × 35 = 420,
21/12 = 21 × 35/12 × 35 = 735/420
Subtract the two like fractions:
960/420 - 735/420 = 960 - 735/420 = 225/420
After reducing the fraction, the answer is 15/28

MathStep (Works offline)

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