Subtract 2/21 from 8/15
8/15 - 2/21 is 46/105.
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,
8/15 = 8 × 7/15 × 7 = 56/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
2/21 = 2 × 5/21 × 5 = 10/105 - Subtract the two like fractions:
56/105 - 10/105 = 56 - 10/105 = 46/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-2/21 8/15-4/21 8/30-2/21 8/15-2/42 24/15-2/21 8/15-6/21 8/45-2/21 8/15-2/63 40/15-2/21 8/15-10/21 8/75-2/21 56/15-2/21 8/15-14/21