Add 21/5 and 84/18
1st number: 4 1/5, 2nd number: 4 12/18
21/5 + 84/18 is 133/15.
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,
84/18 = 84 × 5/18 × 5 = 420/90 - Add the two like fractions:
378/90 + 420/90 = 378 + 420/90 = 798/90 - 798/90 simplified gives 133/15
- So, 21/5 + 84/18 = 133/15
In mixed form: 813/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+84/18 21/10+84/18 21/5+84/36 63/5+84/18 21/15+84/18 21/5+84/54 21/25+84/18 21/5+84/90 21/35+84/18