Add 9/12 and 21/20
1st number: 9/12, 2nd number: 1 1/20
9/12 + 21/20 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
9/12 = 9 × 5/12 × 5 = 45/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Add the two like fractions:
45/60 + 63/60 = 45 + 63/60 = 108/60 - 108/60 simplified gives 9/5
- So, 9/12 + 21/20 = 9/5
In mixed form: 14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12+21/20 9/12+42/20 9/24+21/20 9/12+21/40 27/12+21/20 9/12+63/20 9/36+21/20 9/12+21/60 45/12+21/20 9/60+21/20 63/12+21/20 9/84+21/20