Add 20/12 and 90/81
1st number: 1 8/12, 2nd number: 1 9/81
20/12 + 90/81 is 25/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
20/12 = 20 × 27/12 × 27 = 540/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
90/81 = 90 × 4/81 × 4 = 360/324 - Add the two like fractions:
540/324 + 360/324 = 540 + 360/324 = 900/324 - 900/324 simplified gives 25/9
- So, 20/12 + 90/81 = 25/9
In mixed form: 27/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+90/81 20/24+90/81 60/12+90/81 20/36+90/81 20/60+90/81 20/84+90/81