Add 21/27 and 70/12
1st number: 21/27, 2nd number: 5 10/12
21/27 + 70/12 is 119/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 12 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 27 × 4 = 108,
21/27 = 21 × 4/27 × 4 = 84/108 - Likewise, for the 2nd fraction, since 12 × 9 = 108,
70/12 = 70 × 9/12 × 9 = 630/108 - Add the two like fractions:
84/108 + 630/108 = 84 + 630/108 = 714/108 - 714/108 simplified gives 119/18
- So, 21/27 + 70/12 = 119/18
In mixed form: 611/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27+70/12 21/54+70/12 21/27+70/24 63/27+70/12 21/81+70/12 21/27+70/36 21/27+70/60 21/27+70/84