Subtract 1/21 from 5/15
5/15 - 1/21 is 2/7.
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,
5/15 = 5 × 7/15 × 7 = 35/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Subtract the two like fractions:
35/105 - 5/105 = 35 - 5/105 = 30/105 - After reducing the fraction, the answer is 2/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/15-1/21 5/15-2/21 5/30-1/21 5/15-1/42 5/15-3/21 5/45-1/21 5/15-1/63 25/15-1/21 5/15-5/21 5/75-1/21 35/15-1/21 5/15-7/21