Add 5/2 and 15/21
1st number: 2 1/2, 2nd number: 15/21
5/2 + 15/21 is 45/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
5/2 = 5 × 21/2 × 21 = 105/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Add the two like fractions:
105/42 + 30/42 = 105 + 30/42 = 135/42 - 135/42 simplified gives 45/14
- So, 5/2 + 15/21 = 45/14
In mixed form: 33/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/2+15/21 5/2+30/21 5/4+15/21 5/2+15/42 15/2+15/21 5/2+45/21 5/6+15/21 5/2+15/63 25/2+15/21 5/2+75/21 5/10+15/21 35/2+15/21 5/14+15/21