Add 21/5 and 3/18
1st number: 4 1/5, 2nd number: 3/18
21/5 + 3/18 is 131/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
21/5 = 21 × 18/5 × 18 = 378/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
3/18 = 3 × 5/18 × 5 = 15/90 - Add the two like fractions:
378/90 + 15/90 = 378 + 15/90 = 393/90 - 393/90 simplified gives 131/30
- So, 21/5 + 3/18 = 131/30
In mixed form: 411/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+3/18 21/5+6/18 21/10+3/18 21/5+3/36 63/5+3/18 21/5+9/18 21/15+3/18 21/5+3/54 21/5+15/18 21/25+3/18 21/5+3/90 21/5+21/18 21/35+3/18