Add 12/24 and 28/21
1st number: 12/24, 2nd number: 1 7/21
12/24 + 28/21 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
12/24 = 12 × 7/24 × 7 = 84/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
28/21 = 28 × 8/21 × 8 = 224/168 - Add the two like fractions:
84/168 + 224/168 = 84 + 224/168 = 308/168 - 308/168 simplified gives 11/6
- So, 12/24 + 28/21 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/24+56/21 12/48+28/21 12/24+28/42 36/24+28/21 12/24+84/21 12/72+28/21 12/24+28/63 60/24+28/21 84/24+28/21