Add 27/20 and 9/21
1st number: 1 7/20, 2nd number: 9/21
27/20 + 9/21 is 249/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
27/20 = 27 × 21/20 × 21 = 567/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
9/21 = 9 × 20/21 × 20 = 180/420 - Add the two like fractions:
567/420 + 180/420 = 567 + 180/420 = 747/420 - 747/420 simplified gives 249/140
- So, 27/20 + 9/21 = 249/140
In mixed form: 1109/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/20+9/21 27/20+18/21 27/40+9/21 27/20+9/42 81/20+9/21 27/20+27/21 27/60+9/21 27/20+9/63 27/20+45/21 27/20+63/21