Add 12/5 and 21/12
1st number: 2 2/5, 2nd number: 1 9/12
12/5 + 21/12 is 83/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 5 × 12 = 60,
12/5 = 12 × 12/5 × 12 = 144/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Add the two like fractions:
144/60 + 105/60 = 144 + 105/60 = 249/60 - 249/60 simplified gives 83/20
- So, 12/5 + 21/12 = 83/20
In mixed form: 43/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/5+21/12 12/5+42/12 12/10+21/12 12/5+21/24 36/5+21/12 12/5+63/12 12/15+21/12 12/5+21/36 60/5+21/12 12/25+21/12 12/5+21/60 84/5+21/12 12/35+21/12 12/5+21/84