Subtract 21/7 from 3/15
1st number: 3/15, 2nd number: 3 0/7
3/15 - 21/7 is -14/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
3/15 = 3 × 7/15 × 7 = 21/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
21/7 = 21 × 15/7 × 15 = 315/105 - Subtract the two like fractions:
21/105 - 315/105 = 21 - 315/105 = -294/105 - After reducing the fraction, the answer is -14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/15-21/7 3/15-42/7 3/30-21/7 3/15-21/14 9/15-21/7 3/15-63/7 3/45-21/7 3/75-21/7 3/15-21/35 21/15-21/7 3/15-21/49