Subtract 21/14 from 9/15
1st number: 9/15, 2nd number: 1 7/14
9/15 - 21/14 is -9/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 14 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
9/15 = 9 × 14/15 × 14 = 126/210 - Likewise, for the 2nd fraction, since 14 × 15 = 210,
21/14 = 21 × 15/14 × 15 = 315/210 - Subtract the two like fractions:
126/210 - 315/210 = 126 - 315/210 = -189/210 - After reducing the fraction, the answer is -9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15-21/14 9/15-42/14 9/30-21/14 9/15-21/28 27/15-21/14 9/15-63/14 9/45-21/14 9/15-21/42 45/15-21/14 9/75-21/14 9/15-21/70 63/15-21/14 9/15-21/98