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