Subtract 7/32 from 21/18, Solve 1 3/18

Subtract 7/32 from 21/18

1^st number: 1 3/18, 2^nd number: 7/32

21/18 - 7/32 is 91/96.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 32 is 288

Next, find the equivalent fraction of both fractional numbers with denominator 288
For the 1st fraction, since 18 × 16 = 288,
21/18 = 21 × 16/18 × 16 = 336/288
Likewise, for the 2nd fraction, since 32 × 9 = 288,
7/32 = 7 × 9/32 × 9 = 63/288
Subtract the two like fractions:
336/288 - 63/288 = 336 - 63/288 = 273/288
After reducing the fraction, the answer is 91/96

MathStep (Works offline)

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