Subtract 4/21 from 1/15
1/15 - 4/21 is -13/105.
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,
4/21 = 4 × 5/21 × 5 = 20/105 - Subtract the two like fractions:
7/105 - 20/105 = 7 - 20/105 = -13/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/15-4/21 1/15-8/21 1/30-4/21 1/15-4/42 3/15-4/21 1/15-12/21 1/45-4/21 1/15-4/63 5/15-4/21 1/15-20/21 1/75-4/21 7/15-4/21 1/15-28/21