Subtract 25/36 from 12/21
12/21 - 25/36 is -31/252.
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,
12/21 = 12 × 12/21 × 12 = 144/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
25/36 = 25 × 7/36 × 7 = 175/252 - Subtract the two like fractions:
144/252 - 175/252 = 144 - 175/252 = -31/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-25/36 12/21-50/36 12/42-25/36 12/21-25/72 36/21-25/36 12/21-75/36 12/63-25/36 60/21-25/36 84/21-25/36