Add 9/21 and 6/15
9/21 + 6/15 is 29/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
6/15 = 6 × 7/15 × 7 = 42/105 - Add the two like fractions:
45/105 + 42/105 = 45 + 42/105 = 87/105 - 87/105 simplified gives 29/35
- So, 9/21 + 6/15 = 29/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+6/15 9/21+12/15 9/42+6/15 9/21+6/30 27/21+6/15 9/21+18/15 9/63+6/15 9/21+6/45 45/21+6/15 9/21+30/15 9/21+6/75 63/21+6/15 9/21+42/15