Add 21/9 and 27/20
1st number: 2 3/9, 2nd number: 1 7/20
21/9 + 27/20 is 221/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
21/9 = 21 × 20/9 × 20 = 420/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
27/20 = 27 × 9/20 × 9 = 243/180 - Add the two like fractions:
420/180 + 243/180 = 420 + 243/180 = 663/180 - 663/180 simplified gives 221/60
- So, 21/9 + 27/20 = 221/60
In mixed form: 341/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+27/20 21/9+54/20 21/18+27/20 21/9+27/40 63/9+27/20 21/9+81/20 21/27+27/20 21/9+27/60 21/45+27/20 21/63+27/20