Add 30/27 and 21/90
1st number: 1 3/27, 2nd number: 21/90
30/27 + 21/90 is 121/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 90 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
30/27 = 30 × 10/27 × 10 = 300/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
21/90 = 21 × 3/90 × 3 = 63/270 - Add the two like fractions:
300/270 + 63/270 = 300 + 63/270 = 363/270 - 363/270 simplified gives 121/90
- So, 30/27 + 21/90 = 121/90
In mixed form: 131/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/27+21/90 30/27+42/90 30/54+21/90 90/27+21/90 30/27+63/90 30/81+21/90