Subtract 2/21 from 3/36
3/36 - 2/21 is -1/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
3/36 = 3 × 7/36 × 7 = 21/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
2/21 = 2 × 12/21 × 12 = 24/252 - Subtract the two like fractions:
21/252 - 24/252 = 21 - 24/252 = -3/252 - After reducing the fraction, the answer is -1/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/36-2/21 3/36-4/21 3/72-2/21 3/36-2/42 9/36-2/21 3/36-6/21 3/36-2/63 15/36-2/21 3/36-10/21 21/36-2/21 3/36-14/21