Subtract 35/15 from 21/30
1st number: 21/30, 2nd number: 2 5/15
21/30 - 35/15 is -49/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
35/15 = 35 × 2/15 × 2 = 70/30 - Subtract the two like fractions:
21/30 - 70/30 = 21 - 70/30 = -49/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-35/15 21/30-70/15 21/60-35/15 21/30-35/30 63/30-35/15 21/90-35/15 21/30-35/45 21/30-35/75