Subtract 3/49 from 1/21
1/21 - 3/49 is -2/147.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 49 is 147
Next, find the equivalent fraction of both fractional numbers with denominator 147 - For the 1st fraction, since 21 × 7 = 147,
1/21 = 1 × 7/21 × 7 = 7/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
3/49 = 3 × 3/49 × 3 = 9/147 - Subtract the two like fractions:
7/147 - 9/147 = 7 - 9/147 = -2/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-3/49 1/21-6/49 1/42-3/49 1/21-3/98 3/21-3/49 1/21-9/49 1/63-3/49 5/21-3/49 1/21-15/49 7/21-3/49 1/21-21/49