Subtract 56/36 from 90/21
1st number: 4 6/21, 2nd number: 1 20/36
90/21 - 56/36 is 172/63.
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,
90/21 = 90 × 12/21 × 12 = 1080/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
56/36 = 56 × 7/36 × 7 = 392/252 - Subtract the two like fractions:
1080/252 - 392/252 = 1080 - 392/252 = 688/252 - After reducing the fraction, the answer is 172/63
- In mixed form: 246/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-56/36 90/21-56/72 90/63-56/36