Subtract 18/49 from 2/21
2/21 - 18/49 is -40/147.
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,
2/21 = 2 × 7/21 × 7 = 14/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
18/49 = 18 × 3/49 × 3 = 54/147 - Subtract the two like fractions:
14/147 - 54/147 = 14 - 54/147 = -40/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-18/49 2/21-36/49 2/42-18/49 2/21-18/98 6/21-18/49 2/21-54/49 2/63-18/49 10/21-18/49 2/21-90/49 14/21-18/49