Add 8/5 and 21/18
1st number: 1 3/5, 2nd number: 1 3/18
8/5 + 21/18 is 83/30.
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,
8/5 = 8 × 18/5 × 18 = 144/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Add the two like fractions:
144/90 + 105/90 = 144 + 105/90 = 249/90 - 249/90 simplified gives 83/30
- So, 8/5 + 21/18 = 83/30
In mixed form: 223/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/5+21/18 8/5+42/18 8/10+21/18 8/5+21/36 24/5+21/18 8/5+63/18 8/15+21/18 8/5+21/54 40/5+21/18 8/25+21/18 8/5+21/90 56/5+21/18 8/35+21/18