Add 3/20 and 21/12
1st number: 3/20, 2nd number: 1 9/12
3/20 + 21/12 is 19/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
3/20 = 3 × 3/20 × 3 = 9/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Add the two like fractions:
9/60 + 105/60 = 9 + 105/60 = 114/60 - 114/60 simplified gives 19/10
- So, 3/20 + 21/12 = 19/10
In mixed form: 19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20+21/12 3/20+42/12 3/40+21/12 3/20+21/24 9/20+21/12 3/20+63/12 3/60+21/12 3/20+21/36 15/20+21/12 3/20+21/60 21/20+21/12 3/20+21/84