Subtract 21/7 from 15/35
1st number: 15/35, 2nd number: 3 0/7
15/35 - 21/7 is -18/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 7 is 35
Next, find the equivalent fraction of both fractional numbers with denominator 35 - For the 1st fraction, since 35 × 1 = 35,
15/35 = 15 × 1/35 × 1 = 15/35 - Likewise, for the 2nd fraction, since 7 × 5 = 35,
21/7 = 21 × 5/7 × 5 = 105/35 - Subtract the two like fractions:
15/35 - 105/35 = 15 - 105/35 = -90/35 - After reducing the fraction, the answer is -18/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/35-21/7 15/35-42/7 15/70-21/7 15/35-21/14 45/35-21/7 15/35-63/7 75/35-21/7 15/35-21/35 15/35-21/49