Add 5/15 and 21/7
1st number: 5/15, 2nd number: 3 0/7
5/15 + 21/7 is 10/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
5/15 = 5 × 7/15 × 7 = 35/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
21/7 = 21 × 15/7 × 15 = 315/105 - Add the two like fractions:
35/105 + 315/105 = 35 + 315/105 = 350/105 - 350/105 simplified gives 10/3
- So, 5/15 + 21/7 = 10/3
In mixed form: 31/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/15+21/7 5/15+42/7 5/30+21/7 5/15+21/14 5/15+63/7 5/45+21/7 25/15+21/7 5/75+21/7 5/15+21/35 35/15+21/7 5/15+21/49