Add 4/12 and 24/21
1st number: 4/12, 2nd number: 1 3/21
4/12 + 24/21 is 31/21.
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,
4/12 = 4 × 7/12 × 7 = 28/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
24/21 = 24 × 4/21 × 4 = 96/84 - Add the two like fractions:
28/84 + 96/84 = 28 + 96/84 = 124/84 - 124/84 simplified gives 31/21
- So, 4/12 + 24/21 = 31/21
In mixed form: 110/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+24/21 4/12+48/21 4/24+24/21 4/12+24/42 4/12+72/21 4/36+24/21 4/12+24/63 20/12+24/21 4/60+24/21 28/12+24/21 4/84+24/21