Add 18/12 and 21/10
1st number: 1 6/12, 2nd number: 2 1/10
18/12 + 21/10 is 18/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
18/12 = 18 × 5/12 × 5 = 90/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
21/10 = 21 × 6/10 × 6 = 126/60 - Add the two like fractions:
90/60 + 126/60 = 90 + 126/60 = 216/60 - 216/60 simplified gives 18/5
- So, 18/12 + 21/10 = 18/5
In mixed form: 33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12+21/10 18/12+42/10 18/24+21/10 18/12+21/20 54/12+21/10 18/12+63/10 18/36+21/10 18/12+21/30 90/12+21/10 18/60+21/10 18/12+21/50 18/84+21/10 18/12+21/70