Add 7/2 and 21/15
1st number: 3 1/2, 2nd number: 1 6/15
7/2 + 21/15 is 49/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 2 × 15 = 30,
7/2 = 7 × 15/2 × 15 = 105/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Add the two like fractions:
105/30 + 42/30 = 105 + 42/30 = 147/30 - 147/30 simplified gives 49/10
- So, 7/2 + 21/15 = 49/10
In mixed form: 49/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2+21/15 7/2+42/15 7/4+21/15 7/2+21/30 21/2+21/15 7/2+63/15 7/6+21/15 7/2+21/45 35/2+21/15 7/10+21/15 7/2+21/75 49/2+21/15 7/14+21/15