Add 21/3 and 18/7
1st number: 7 0/3, 2nd number: 2 4/7
21/3 + 18/7 is 67/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
21/3 = 21 × 7/3 × 7 = 147/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
18/7 = 18 × 3/7 × 3 = 54/21 - Add the two like fractions:
147/21 + 54/21 = 147 + 54/21 = 201/21 - 201/21 simplified gives 67/7
- So, 21/3 + 18/7 = 67/7
In mixed form: 94/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+18/7 21/3+36/7 21/6+18/7 21/3+18/14 63/3+18/7 21/3+54/7 21/9+18/7 21/3+18/21 21/3+90/7 21/15+18/7 21/3+18/35 21/3+18/49