Add 21/15 and 7/35
1st number: 1 6/15, 2nd number: 7/35
21/15 + 7/35 is 8/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
21/15 = 21 × 7/15 × 7 = 147/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
7/35 = 7 × 3/35 × 3 = 21/105 - Add the two like fractions:
147/105 + 21/105 = 147 + 21/105 = 168/105 - 168/105 simplified gives 8/5
- So, 21/15 + 7/35 = 8/5
In mixed form: 13/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+7/35 21/15+14/35 21/30+7/35 21/15+7/70 63/15+7/35 21/15+21/35 21/45+7/35 21/75+7/35 21/15+49/35