Add 20/90 and 9/4
1st number: 20/90, 2nd number: 2 1/4
20/90 + 9/4 is 89/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 4 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
20/90 = 20 × 2/90 × 2 = 40/180 - Likewise, for the 2nd fraction, since 4 × 45 = 180,
9/4 = 9 × 45/4 × 45 = 405/180 - Add the two like fractions:
40/180 + 405/180 = 40 + 405/180 = 445/180 - 445/180 simplified gives 89/36
- So, 20/90 + 9/4 = 89/36
In mixed form: 217/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+9/4 20/90+18/4 20/90+9/8 60/90+9/4 20/90+27/4 20/90+9/12 20/90+45/4 20/90+9/20 20/90+63/4 20/90+9/28