Add 8/5 and 21/90
1st number: 1 3/5, 2nd number: 21/90
8/5 + 21/90 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 90 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 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
144/90 + 21/90 = 144 + 21/90 = 165/90 - 165/90 simplified gives 11/6
- So, 8/5 + 21/90 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/5+21/90 8/5+42/90 8/10+21/90 24/5+21/90 8/5+63/90 8/15+21/90 40/5+21/90 8/25+21/90 56/5+21/90 8/35+21/90