Subtract 4/21 from 10/15
10/15 - 4/21 is 10/21.
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,
10/15 = 10 × 7/15 × 7 = 70/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
4/21 = 4 × 5/21 × 5 = 20/105 - Subtract the two like fractions:
70/105 - 20/105 = 70 - 20/105 = 50/105 - After reducing the fraction, the answer is 10/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/15-4/21 10/15-8/21 10/30-4/21 10/15-4/42 30/15-4/21 10/15-12/21 10/45-4/21 10/15-4/63 50/15-4/21 10/15-20/21 10/75-4/21 70/15-4/21 10/15-28/21