Add 12/24 and 3/21
12/24 + 3/21 is 9/14.
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,
3/21 = 3 × 8/21 × 8 = 24/168 - Add the two like fractions:
84/168 + 24/168 = 84 + 24/168 = 108/168 - 108/168 simplified gives 9/14
- So, 12/24 + 3/21 = 9/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/24+6/21 12/48+3/21 12/24+3/42 36/24+3/21 12/24+9/21 12/72+3/21 12/24+3/63 60/24+3/21 12/24+15/21 84/24+3/21