Subtract 21/70 from 5/7
5/7 - 21/70 is 29/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
5/7 = 5 × 10/7 × 10 = 50/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Subtract the two like fractions:
50/70 - 21/70 = 50 - 21/70 = 29/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/7-21/70 5/7-42/70 5/14-21/70 15/7-21/70 5/7-63/70 5/21-21/70 25/7-21/70 5/35-21/70 35/7-21/70 5/49-21/70