Subtract 7/36 from 1/21
1/21 - 7/36 is -37/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
1/21 = 1 × 12/21 × 12 = 12/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
7/36 = 7 × 7/36 × 7 = 49/252 - Subtract the two like fractions:
12/252 - 49/252 = 12 - 49/252 = -37/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-7/36 1/21-14/36 1/42-7/36 1/21-7/72 3/21-7/36 1/21-21/36 1/63-7/36 5/21-7/36 1/21-35/36 7/21-7/36 1/21-49/36