Add 3/4 and 81/90
3/4 + 81/90 is 33/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
3/4 = 3 × 45/4 × 45 = 135/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
81/90 = 81 × 2/90 × 2 = 162/180 - Add the two like fractions:
135/180 + 162/180 = 135 + 162/180 = 297/180 - 297/180 simplified gives 33/20
- So, 3/4 + 81/90 = 33/20
In mixed form: 113/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/4+81/90 3/8+81/90 9/4+81/90 3/12+81/90 15/4+81/90 3/20+81/90 21/4+81/90 3/28+81/90