Subtract 15/18 from 32/21
1st number: 1 11/21, 2nd number: 15/18
32/21 - 15/18 is 29/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
32/21 = 32 × 6/21 × 6 = 192/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
15/18 = 15 × 7/18 × 7 = 105/126 - Subtract the two like fractions:
192/126 - 105/126 = 192 - 105/126 = 87/126 - After reducing the fraction, the answer is 29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/21-15/18 32/21-30/18 32/42-15/18 32/21-15/36 96/21-15/18 32/21-45/18 32/63-15/18 32/21-15/54 32/21-75/18 32/21-15/90