Add 3/21 and 6/18
3/21 + 6/18 is 10/21.
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,
3/21 = 3 × 6/21 × 6 = 18/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
6/18 = 6 × 7/18 × 7 = 42/126 - Add the two like fractions:
18/126 + 42/126 = 18 + 42/126 = 60/126 - 60/126 simplified gives 10/21
- So, 3/21 + 6/18 = 10/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+6/18 3/21+12/18 3/42+6/18 3/21+6/36 9/21+6/18 3/63+6/18 3/21+6/54 15/21+6/18 3/21+30/18 3/21+6/90 3/21+42/18