Add 28/12 and 4/21
1st number: 2 4/12, 2nd number: 4/21
28/12 + 4/21 is 53/21.
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,
4/21 = 4 × 4/21 × 4 = 16/84 - Add the two like fractions:
196/84 + 16/84 = 196 + 16/84 = 212/84 - 212/84 simplified gives 53/21
- So, 28/12 + 4/21 = 53/21
In mixed form: 211/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12+4/21 28/12+8/21 28/24+4/21 28/12+4/42 84/12+4/21 28/12+12/21 28/36+4/21 28/12+4/63 28/12+20/21 28/60+4/21 28/12+28/21 28/84+4/21