Subtract 49/36 from 20/21
1st number: 20/21, 2nd number: 1 13/36
20/21 - 49/36 is -103/252.
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,
20/21 = 20 × 12/21 × 12 = 240/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
49/36 = 49 × 7/36 × 7 = 343/252 - Subtract the two like fractions:
240/252 - 343/252 = 240 - 343/252 = -103/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-49/36 20/21-98/36 20/42-49/36 20/21-49/72 60/21-49/36 20/63-49/36