Subtract 2/36 from 1/21
1/21 - 2/36 is -1/126.
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,
2/36 = 2 × 7/36 × 7 = 14/252 - Subtract the two like fractions:
12/252 - 14/252 = 12 - 14/252 = -2/252 - After reducing the fraction, the answer is -1/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-2/36 1/21-4/36 1/42-2/36 1/21-2/72 3/21-2/36 1/21-6/36 1/63-2/36 5/21-2/36 1/21-10/36 7/21-2/36 1/21-14/36