Add 20/81 and 90/4
1st number: 20/81, 2nd number: 22 2/4
20/81 + 90/4 is 3685/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
20/81 = 20 × 4/81 × 4 = 80/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
90/4 = 90 × 81/4 × 81 = 7290/324 - Add the two like fractions:
80/324 + 7290/324 = 80 + 7290/324 = 7370/324 - 7370/324 simplified gives 3685/162
- So, 20/81 + 90/4 = 3685/162
In mixed form: 22121/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81+90/4 20/81+90/8 60/81+90/4 20/81+90/12 20/81+90/20 20/81+90/28