Add 15/4 and 6/21
1st number: 3 3/4, 2nd number: 6/21
15/4 + 6/21 is 113/28.
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,
6/21 = 6 × 4/21 × 4 = 24/84 - Add the two like fractions:
315/84 + 24/84 = 315 + 24/84 = 339/84 - 339/84 simplified gives 113/28
- So, 15/4 + 6/21 = 113/28
In mixed form: 41/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/4+6/21 15/4+12/21 15/8+6/21 15/4+6/42 45/4+6/21 15/4+18/21 15/12+6/21 15/4+6/63 75/4+6/21 15/4+30/21 15/20+6/21 15/4+42/21 15/28+6/21