Subtract 21/5 from 21/14
1st number: 1 7/14, 2nd number: 4 1/5
21/14 - 21/5 is -27/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 5 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 14 × 5 = 70,
21/14 = 21 × 5/14 × 5 = 105/70 - Likewise, for the 2nd fraction, since 5 × 14 = 70,
21/5 = 21 × 14/5 × 14 = 294/70 - Subtract the two like fractions:
105/70 - 294/70 = 105 - 294/70 = -189/70 - After reducing the fraction, the answer is -27/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14-21/5 21/14-42/5 21/28-21/5 21/14-21/10 63/14-21/5 21/14-63/5 21/42-21/5 21/14-21/15 21/70-21/5 21/14-21/25 21/98-21/5 21/14-21/35