Add 21/15 and 24/54
1st number: 1 6/15, 2nd number: 24/54
21/15 + 24/54 is 83/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 15 × 18 = 270,
21/15 = 21 × 18/15 × 18 = 378/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
24/54 = 24 × 5/54 × 5 = 120/270 - Add the two like fractions:
378/270 + 120/270 = 378 + 120/270 = 498/270 - 498/270 simplified gives 83/45
- So, 21/15 + 24/54 = 83/45
In mixed form: 138/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+24/54 21/15+48/54 21/30+24/54 63/15+24/54 21/15+72/54 21/45+24/54 21/75+24/54