Subtract 21/36 from 6/28
6/28 - 21/36 is -31/84.
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,
6/28 = 6 × 9/28 × 9 = 54/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Subtract the two like fractions:
54/252 - 147/252 = 54 - 147/252 = -93/252 - After reducing the fraction, the answer is -31/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/28-21/36 6/28-42/36 6/56-21/36 6/28-21/72 18/28-21/36 6/28-63/36 6/84-21/36 30/28-21/36 42/28-21/36