Subtract 7/49 from 21/70
21/70 - 7/49 is 11/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 49 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 70 × 7 = 490,
21/70 = 21 × 7/70 × 7 = 147/490 - Likewise, for the 2nd fraction, since 49 × 10 = 490,
7/49 = 7 × 10/49 × 10 = 70/490 - Subtract the two like fractions:
147/490 - 70/490 = 147 - 70/490 = 77/490 - After reducing the fraction, the answer is 11/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-7/49 21/70-14/49 21/70-7/98 63/70-7/49 21/70-21/49 21/70-35/49