Add 8/15 and 9/21
8/15 + 9/21 is 101/105.
Steps for adding 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,
9/21 = 9 × 5/21 × 5 = 45/105 - Add the two like fractions:
56/105 + 45/105 = 56 + 45/105 = 101/105 - So, 8/15 + 9/21 = 101/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15+9/21 8/15+18/21 8/30+9/21 8/15+9/42 24/15+9/21 8/15+27/21 8/45+9/21 8/15+9/63 40/15+9/21 8/15+45/21 8/75+9/21 56/15+9/21 8/15+63/21