Add 90/5 and 21/8
1st number: 18 0/5, 2nd number: 2 5/8
90/5 + 21/8 is 165/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
90/5 = 90 × 8/5 × 8 = 720/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Add the two like fractions:
720/40 + 105/40 = 720 + 105/40 = 825/40 - 825/40 simplified gives 165/8
- So, 90/5 + 21/8 = 165/8
In mixed form: 205/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5+42/8 90/10+21/8 90/5+21/16 90/5+63/8 90/15+21/8 90/5+21/24 90/25+21/8 90/5+21/40 90/35+21/8 90/5+21/56