Add 6/15 and 12/21
6/15 + 12/21 is 34/35.
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,
6/15 = 6 × 7/15 × 7 = 42/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
12/21 = 12 × 5/21 × 5 = 60/105 - Add the two like fractions:
42/105 + 60/105 = 42 + 60/105 = 102/105 - 102/105 simplified gives 34/35
- So, 6/15 + 12/21 = 34/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/15+12/21 6/15+24/21 6/30+12/21 6/15+12/42 18/15+12/21 6/15+36/21 6/45+12/21 6/15+12/63 30/15+12/21 6/15+60/21 6/75+12/21 42/15+12/21 6/15+84/21