Subtract 2/15 from 1/21
1/21 - 2/15 is -3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
2/15 = 2 × 7/15 × 7 = 14/105 - Subtract the two like fractions:
5/105 - 14/105 = 5 - 14/105 = -9/105 - After reducing the fraction, the answer is -3/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-2/15 1/21-4/15 1/42-2/15 1/21-2/30 3/21-2/15 1/21-6/15 1/63-2/15 1/21-2/45 5/21-2/15 1/21-10/15 1/21-2/75 7/21-2/15 1/21-14/15