Add 8/21 and 21/18
1st number: 8/21, 2nd number: 1 3/18
8/21 + 21/18 is 65/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
8/21 = 8 × 6/21 × 6 = 48/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Add the two like fractions:
48/126 + 147/126 = 48 + 147/126 = 195/126 - 195/126 simplified gives 65/42
- So, 8/21 + 21/18 = 65/42
In mixed form: 123/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+21/18 8/21+42/18 8/42+21/18 8/21+21/36 24/21+21/18 8/21+63/18 8/63+21/18 8/21+21/54 40/21+21/18 8/21+21/90 56/21+21/18