Add 21/15 and 60/18
1st number: 1 6/15, 2nd number: 3 6/18
21/15 + 60/18 is 71/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
21/15 = 21 × 6/15 × 6 = 126/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
60/18 = 60 × 5/18 × 5 = 300/90 - Add the two like fractions:
126/90 + 300/90 = 126 + 300/90 = 426/90 - 426/90 simplified gives 71/15
- So, 21/15 + 60/18 = 71/15
In mixed form: 411/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+60/18 21/30+60/18 21/15+60/36 63/15+60/18 21/45+60/18 21/15+60/54 21/75+60/18 21/15+60/90