Add 18/12 and 7/21
1st number: 1 6/12, 2nd number: 7/21
18/12 + 7/21 is 11/6.
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,
18/12 = 18 × 7/12 × 7 = 126/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Add the two like fractions:
126/84 + 28/84 = 126 + 28/84 = 154/84 - 154/84 simplified gives 11/6
- So, 18/12 + 7/21 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12+7/21 18/12+14/21 18/24+7/21 18/12+7/42 54/12+7/21 18/36+7/21 18/12+7/63 90/12+7/21 18/12+35/21 18/60+7/21 18/12+49/21 18/84+7/21