Subtract 28/32 from 49/21, Solve 2 7/21

Subtract 28/32 from 49/21

1^st number: 2 7/21, 2^nd number: 28/32

49/21 - 28/32 is 35/24.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 32 is 672

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 21 × 32 = 672,
49/21 = 49 × 32/21 × 32 = 1568/672
Likewise, for the 2nd fraction, since 32 × 21 = 672,
28/32 = 28 × 21/32 × 21 = 588/672
Subtract the two like fractions:
1568/672 - 588/672 = 1568 - 588/672 = 980/672
After reducing the fraction, the answer is 35/24
In mixed form: 111/24

MathStep (Works offline)

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