Subtract 28/32 from 30/21
1st number: 1 9/21, 2nd number: 28/32
30/21 - 28/32 is 31/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 32 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 21 × 32 = 672,
30/21 = 30 × 32/21 × 32 = 960/672 - Likewise, for the 2nd fraction, since 32 × 21 = 672,
28/32 = 28 × 21/32 × 21 = 588/672 - Subtract the two like fractions:
960/672 - 588/672 = 960 - 588/672 = 372/672 - After reducing the fraction, the answer is 31/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-28/32 30/21-56/32 30/42-28/32 30/21-28/64 90/21-28/32 30/21-84/32 30/63-28/32 30/21-28/96