Subtract 8/21 from 4/15
4/15 - 8/21 is -4/35.
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,
4/15 = 4 × 7/15 × 7 = 28/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
8/21 = 8 × 5/21 × 5 = 40/105 - Subtract the two like fractions:
28/105 - 40/105 = 28 - 40/105 = -12/105 - After reducing the fraction, the answer is -4/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/15-8/21 4/15-16/21 4/30-8/21 4/15-8/42 12/15-8/21 4/15-24/21 4/45-8/21 4/15-8/63 20/15-8/21 4/15-40/21 4/75-8/21 28/15-8/21 4/15-56/21