Subtract 21/36 from 6/21
6/21 - 21/36 is -25/84.
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,
6/21 = 6 × 12/21 × 12 = 72/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Subtract the two like fractions:
72/252 - 147/252 = 72 - 147/252 = -75/252 - After reducing the fraction, the answer is -25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-21/36 6/21-42/36 6/42-21/36 6/21-21/72 18/21-21/36 6/21-63/36 6/63-21/36 30/21-21/36 42/21-21/36