Add 21/90 and 18/9
1st number: 21/90, 2nd number: 2 0/9
21/90 + 18/9 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
18/9 = 18 × 10/9 × 10 = 180/90 - Add the two like fractions:
21/90 + 180/90 = 21 + 180/90 = 201/90 - 201/90 simplified gives 67/30
- So, 21/90 + 18/9 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+18/9 21/90+36/9 63/90+18/9 21/90+54/9 21/90+18/27 21/90+90/9 21/90+18/45 21/90+18/63