Add 18/5 and 21/30
1st number: 3 3/5, 2nd number: 21/30
18/5 + 21/30 is 43/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 5 × 6 = 30,
18/5 = 18 × 6/5 × 6 = 108/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Add the two like fractions:
108/30 + 21/30 = 108 + 21/30 = 129/30 - 129/30 simplified gives 43/10
- So, 18/5 + 21/30 = 43/10
In mixed form: 43/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5+21/30 18/5+42/30 18/10+21/30 18/5+21/60 54/5+21/30 18/5+63/30 18/15+21/30 18/5+21/90 90/5+21/30 18/25+21/30 18/35+21/30