Subtract 21/70 from 7/35
7/35 - 21/70 is -1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 35 × 2 = 70,
7/35 = 7 × 2/35 × 2 = 14/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Subtract the two like fractions:
14/70 - 21/70 = 14 - 21/70 = -7/70 - After reducing the fraction, the answer is -1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/35-21/70 7/35-42/70 7/70-21/70 21/35-21/70 7/35-63/70 49/35-21/70