Subtract 21/35 from 7/15
7/15 - 21/35 is -2/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
7/15 = 7 × 7/15 × 7 = 49/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
21/35 = 21 × 3/35 × 3 = 63/105 - Subtract the two like fractions:
49/105 - 63/105 = 49 - 63/105 = -14/105 - After reducing the fraction, the answer is -2/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/15-21/35 7/15-42/35 7/30-21/35 7/15-21/70 21/15-21/35 7/15-63/35 7/45-21/35 35/15-21/35 7/75-21/35 49/15-21/35