Subtract 28/21 from 27/36
1st number: 27/36, 2nd number: 1 7/21
27/36 - 28/21 is -7/12.
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,
27/36 = 27 × 7/36 × 7 = 189/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
28/21 = 28 × 12/21 × 12 = 336/252 - Subtract the two like fractions:
189/252 - 336/252 = 189 - 336/252 = -147/252 - After reducing the fraction, the answer is -7/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/36-28/21 27/36-56/21 27/72-28/21 27/36-28/42 81/36-28/21 27/36-84/21 27/36-28/63