Add 6/21 and 3/15
6/21 + 3/15 is 17/35.
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,
6/21 = 6 × 5/21 × 5 = 30/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
3/15 = 3 × 7/15 × 7 = 21/105 - Add the two like fractions:
30/105 + 21/105 = 30 + 21/105 = 51/105 - 51/105 simplified gives 17/35
- So, 6/21 + 3/15 = 17/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+3/15 6/21+6/15 6/42+3/15 6/21+3/30 18/21+3/15 6/21+9/15 6/63+3/15 6/21+3/45 30/21+3/15 6/21+3/75 42/21+3/15 6/21+21/15