Subtract 16/36 from 21/28
21/28 - 16/36 is 11/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
16/36 = 16 × 7/36 × 7 = 112/252 - Subtract the two like fractions:
189/252 - 112/252 = 189 - 112/252 = 77/252 - After reducing the fraction, the answer is 11/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-16/36 21/28-32/36 21/56-16/36 21/28-16/72 63/28-16/36 21/28-48/36 21/84-16/36 21/28-80/36