Add 20/18 and 21/5
1st number: 1 2/18, 2nd number: 4 1/5
20/18 + 21/5 is 239/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 5 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
20/18 = 20 × 5/18 × 5 = 100/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
21/5 = 21 × 18/5 × 18 = 378/90 - Add the two like fractions:
100/90 + 378/90 = 100 + 378/90 = 478/90 - 478/90 simplified gives 239/45
- So, 20/18 + 21/5 = 239/45
In mixed form: 514/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18+21/5 20/18+42/5 20/36+21/5 20/18+21/10 60/18+21/5 20/18+63/5 20/54+21/5 20/18+21/15 20/90+21/5 20/18+21/25 20/18+21/35