Add 21/45 and 3/9
21/45 + 3/9 is 4/5.
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,
3/9 = 3 × 5/9 × 5 = 15/45 - Add the two like fractions:
21/45 + 15/45 = 21 + 15/45 = 36/45 - 36/45 simplified gives 4/5
- So, 21/45 + 3/9 = 4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+3/9 21/45+6/9 21/90+3/9 21/45+3/18 63/45+3/9 21/45+3/27 21/45+15/9 21/45+3/45 21/45+21/9 21/45+3/63