Add 12/3 and 27/21
1st number: 4 0/3, 2nd number: 1 6/21
12/3 + 27/21 is 37/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
12/3 = 12 × 7/3 × 7 = 84/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
27/21 = 27 × 1/21 × 1 = 27/21 - Add the two like fractions:
84/21 + 27/21 = 84 + 27/21 = 111/21 - 111/21 simplified gives 37/7
- So, 12/3 + 27/21 = 37/7
In mixed form: 52/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/3+27/21 12/3+54/21 12/6+27/21 12/3+27/42 36/3+27/21 12/3+81/21 12/9+27/21 12/3+27/63 60/3+27/21 12/15+27/21 84/3+27/21 12/21+27/21