Add 21/5 and 40/18
1st number: 4 1/5, 2nd number: 2 4/18
21/5 + 40/18 is 289/45.
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,
40/18 = 40 × 5/18 × 5 = 200/90 - Add the two like fractions:
378/90 + 200/90 = 378 + 200/90 = 578/90 - 578/90 simplified gives 289/45
- So, 21/5 + 40/18 = 289/45
In mixed form: 619/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+40/18 21/5+80/18 21/10+40/18 21/5+40/36 63/5+40/18 21/15+40/18 21/5+40/54 21/25+40/18 21/5+40/90 21/35+40/18