Add 15/4 and 15/21
1st number: 3 3/4, 2nd number: 15/21
15/4 + 15/21 is 125/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
15/4 = 15 × 21/4 × 21 = 315/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Add the two like fractions:
315/84 + 60/84 = 315 + 60/84 = 375/84 - 375/84 simplified gives 125/28
- So, 15/4 + 15/21 = 125/28
In mixed form: 413/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/4+15/21 15/4+30/21 15/8+15/21 15/4+15/42 45/4+15/21 15/4+45/21 15/12+15/21 15/4+15/63 75/4+15/21 15/4+75/21 15/20+15/21 15/28+15/21