Subtract 16/7 from 21/70
1st number: 21/70, 2nd number: 2 2/7
21/70 - 16/7 is -139/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
16/7 = 16 × 10/7 × 10 = 160/70 - Subtract the two like fractions:
21/70 - 160/70 = 21 - 160/70 = -139/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-16/7 21/70-32/7 21/70-16/14 63/70-16/7 21/70-48/7 21/70-16/21 21/70-80/7 21/70-16/35 21/70-16/49