Add 18/60 and 21/18
1st number: 18/60, 2nd number: 1 3/18
18/60 + 21/18 is 22/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 60 × 3 = 180,
18/60 = 18 × 3/60 × 3 = 54/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
21/18 = 21 × 10/18 × 10 = 210/180 - Add the two like fractions:
54/180 + 210/180 = 54 + 210/180 = 264/180 - 264/180 simplified gives 22/15
- So, 18/60 + 21/18 = 22/15
In mixed form: 17/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/60+21/18 18/60+42/18 18/60+21/36 54/60+21/18 18/60+63/18 18/60+21/54 90/60+21/18 18/60+21/90