Add 28/12 and 7/21
1st number: 2 4/12, 2nd number: 7/21
28/12 + 7/21 is 8/3.
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,
7/21 = 7 × 4/21 × 4 = 28/84 - Add the two like fractions:
196/84 + 28/84 = 196 + 28/84 = 224/84 - 224/84 simplified gives 8/3
- So, 28/12 + 7/21 = 8/3
In mixed form: 22/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12+7/21 28/12+14/21 28/24+7/21 28/12+7/42 84/12+7/21 28/36+7/21 28/12+7/63 28/12+35/21 28/60+7/21 28/12+49/21 28/84+7/21