Subtract 21/15 from 6/30
1st number: 6/30, 2nd number: 1 6/15
6/30 - 21/15 is -6/5.
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,
6/30 = 6 × 1/30 × 1 = 6/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Subtract the two like fractions:
6/30 - 42/30 = 6 - 42/30 = -36/30 - After reducing the fraction, the answer is -6/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/30-21/15 6/30-42/15 6/60-21/15 6/30-21/30 18/30-21/15 6/30-63/15 6/90-21/15 6/30-21/45 6/30-21/75 42/30-21/15