Add 9/15 and 6/21
9/15 + 6/21 is 31/35.
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,
9/15 = 9 × 7/15 × 7 = 63/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
6/21 = 6 × 5/21 × 5 = 30/105 - Add the two like fractions:
63/105 + 30/105 = 63 + 30/105 = 93/105 - 93/105 simplified gives 31/35
- So, 9/15 + 6/21 = 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15+6/21 9/15+12/21 9/30+6/21 9/15+6/42 27/15+6/21 9/15+18/21 9/45+6/21 9/15+6/63 45/15+6/21 9/15+30/21 9/75+6/21 63/15+6/21 9/15+42/21