Subtract 1/49 from 21/70
21/70 - 1/49 is 137/490.
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,
1/49 = 1 × 10/49 × 10 = 10/490 - Subtract the two like fractions:
147/490 - 10/490 = 147 - 10/490 = 137/490
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-1/49 21/70-2/49 21/70-1/98 63/70-1/49 21/70-3/49 21/70-5/49 21/70-7/49