Add 21/4 and 63/15
1st number: 5 1/4, 2nd number: 4 3/15
21/4 + 63/15 is 189/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 4 × 15 = 60,
21/4 = 21 × 15/4 × 15 = 315/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
63/15 = 63 × 4/15 × 4 = 252/60 - Add the two like fractions:
315/60 + 252/60 = 315 + 252/60 = 567/60 - 567/60 simplified gives 189/20
- So, 21/4 + 63/15 = 189/20
In mixed form: 99/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+63/15 21/8+63/15 21/4+63/30 63/4+63/15 21/12+63/15 21/4+63/45 21/20+63/15 21/4+63/75 21/28+63/15