Add 18/5 and 21/54
1st number: 3 3/5, 2nd number: 21/54
18/5 + 21/54 is 359/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 5 × 54 = 270,
18/5 = 18 × 54/5 × 54 = 972/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Add the two like fractions:
972/270 + 105/270 = 972 + 105/270 = 1077/270 - 1077/270 simplified gives 359/90
- So, 18/5 + 21/54 = 359/90
In mixed form: 389/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5+21/54 18/5+42/54 18/10+21/54 54/5+21/54 18/5+63/54 18/15+21/54 90/5+21/54 18/25+21/54 18/35+21/54