Add 12/4 and 21/12
1st number: 3 0/4, 2nd number: 1 9/12
12/4 + 21/12 is 19/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 4 × 3 = 12,
12/4 = 12 × 3/4 × 3 = 36/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
21/12 = 21 × 1/12 × 1 = 21/12 - Add the two like fractions:
36/12 + 21/12 = 36 + 21/12 = 57/12 - 57/12 simplified gives 19/4
- So, 12/4 + 21/12 = 19/4
In mixed form: 43/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4+21/12 12/4+42/12 12/8+21/12 12/4+21/24 36/4+21/12 12/4+63/12 12/4+21/36 60/4+21/12 12/20+21/12 12/4+21/60 84/4+21/12 12/28+21/12 12/4+21/84