Subtract 2/21 from 28/36
28/36 - 2/21 is 43/63.
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,
28/36 = 28 × 7/36 × 7 = 196/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
2/21 = 2 × 12/21 × 12 = 24/252 - Subtract the two like fractions:
196/252 - 24/252 = 196 - 24/252 = 172/252 - After reducing the fraction, the answer is 43/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/36-2/21 28/36-4/21 28/72-2/21 28/36-2/42 84/36-2/21 28/36-6/21 28/36-2/63 28/36-10/21 28/36-14/21