Add 28/12 and 3/21
1st number: 2 4/12, 2nd number: 3/21
28/12 + 3/21 is 52/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
28/12 = 28 × 7/12 × 7 = 196/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
3/21 = 3 × 4/21 × 4 = 12/84 - Add the two like fractions:
196/84 + 12/84 = 196 + 12/84 = 208/84 - 208/84 simplified gives 52/21
- So, 28/12 + 3/21 = 52/21
In mixed form: 210/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12+3/21 28/12+6/21 28/24+3/21 28/12+3/42 84/12+3/21 28/12+9/21 28/36+3/21 28/12+3/63 28/12+15/21 28/60+3/21 28/84+3/21