Add 6/21 and 3/9
6/21 + 3/9 is 13/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
6/21 = 6 × 3/21 × 3 = 18/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
3/9 = 3 × 7/9 × 7 = 21/63 - Add the two like fractions:
18/63 + 21/63 = 18 + 21/63 = 39/63 - 39/63 simplified gives 13/21
- So, 6/21 + 3/9 = 13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+3/9 6/21+6/9 6/42+3/9 6/21+3/18 18/21+3/9 6/63+3/9 6/21+3/27 30/21+3/9 6/21+15/9 6/21+3/45 42/21+3/9 6/21+21/9 6/21+3/63