Subtract 9/15 from 6/21
6/21 - 9/15 is -11/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
6/21 = 6 × 5/21 × 5 = 30/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
9/15 = 9 × 7/15 × 7 = 63/105 - Subtract the two like fractions:
30/105 - 63/105 = 30 - 63/105 = -33/105 - After reducing the fraction, the answer is -11/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-9/15 6/21-18/15 6/42-9/15 6/21-9/30 18/21-9/15 6/21-27/15 6/63-9/15 6/21-9/45 30/21-9/15 6/21-45/15 6/21-9/75 42/21-9/15 6/21-63/15