Add 21/45 and 6/9
21/45 + 6/9 is 17/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
6/9 = 6 × 5/9 × 5 = 30/45 - Add the two like fractions:
21/45 + 30/45 = 21 + 30/45 = 51/45 - 51/45 simplified gives 17/15
- So, 21/45 + 6/9 = 17/15
In mixed form: 12/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+6/9 21/45+12/9 21/90+6/9 21/45+6/18 63/45+6/9 21/45+18/9 21/45+6/27 21/45+30/9 21/45+6/45 21/45+42/9 21/45+6/63