Add 6/9 and 18/21
6/9 + 18/21 is 32/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
6/9 = 6 × 7/9 × 7 = 42/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
18/21 = 18 × 3/21 × 3 = 54/63 - Add the two like fractions:
42/63 + 54/63 = 42 + 54/63 = 96/63 - 96/63 simplified gives 32/21
- So, 6/9 + 18/21 = 32/21
In mixed form: 111/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/9+18/21 6/9+36/21 6/18+18/21 6/9+18/42 18/9+18/21 6/9+54/21 6/27+18/21 6/9+18/63 30/9+18/21 6/9+90/21 6/45+18/21 42/9+18/21 6/63+18/21