Add 15/2 and 5/21
1st number: 7 1/2, 2nd number: 5/21
15/2 + 5/21 is 325/42.
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,
15/2 = 15 × 21/2 × 21 = 315/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
5/21 = 5 × 2/21 × 2 = 10/42 - Add the two like fractions:
315/42 + 10/42 = 315 + 10/42 = 325/42 - So, 15/2 + 5/21 = 325/42
In mixed form: 731/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/2+5/21 15/2+10/21 15/4+5/21 15/2+5/42 45/2+5/21 15/2+15/21 15/6+5/21 15/2+5/63 75/2+5/21 15/2+25/21 15/10+5/21 15/2+35/21 15/14+5/21