Add 27/12 and 5/21
1st number: 2 3/12, 2nd number: 5/21
27/12 + 5/21 is 209/84.
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,
27/12 = 27 × 7/12 × 7 = 189/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
5/21 = 5 × 4/21 × 4 = 20/84 - Add the two like fractions:
189/84 + 20/84 = 189 + 20/84 = 209/84 - So, 27/12 + 5/21 = 209/84
In mixed form: 241/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/12+5/21 27/12+10/21 27/24+5/21 27/12+5/42 81/12+5/21 27/12+15/21 27/36+5/21 27/12+5/63 27/12+25/21 27/60+5/21 27/12+35/21 27/84+5/21