Add 30/4 and 21/5
1st number: 7 2/4, 2nd number: 4 1/5
30/4 + 21/5 is 117/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
30/4 = 30 × 5/4 × 5 = 150/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
21/5 = 21 × 4/5 × 4 = 84/20 - Add the two like fractions:
150/20 + 84/20 = 150 + 84/20 = 234/20 - 234/20 simplified gives 117/10
- So, 30/4 + 21/5 = 117/10
In mixed form: 117/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/4+21/5 30/4+42/5 30/8+21/5 30/4+21/10 90/4+21/5 30/4+63/5 30/12+21/5 30/4+21/15 30/20+21/5 30/4+21/25 30/28+21/5 30/4+21/35