Subtract 9/21 from 63/32, Solve 1 31/32

Subtract 9/21 from 63/32

1^st number: 1 31/32, 2^nd number: 9/21

63/32 - 9/21 is 345/224.

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

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 32 × 21 = 672,
63/32 = 63 × 21/32 × 21 = 1323/672
Likewise, for the 2nd fraction, since 21 × 32 = 672,
9/21 = 9 × 32/21 × 32 = 288/672
Subtract the two like fractions:
1323/672 - 288/672 = 1323 - 288/672 = 1035/672
After reducing the fraction, the answer is 345/224
In mixed form: 1121/224

MathStep (Works offline)

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