Add 8/21 and 3/18
8/21 + 3/18 is 23/42.
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,
3/18 = 3 × 7/18 × 7 = 21/126 - Add the two like fractions:
48/126 + 21/126 = 48 + 21/126 = 69/126 - 69/126 simplified gives 23/42
- So, 8/21 + 3/18 = 23/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+3/18 8/21+6/18 8/42+3/18 8/21+3/36 24/21+3/18 8/21+9/18 8/63+3/18 8/21+3/54 40/21+3/18 8/21+15/18 8/21+3/90 56/21+3/18 8/21+21/18