Add 20/12 and 5/81
1st number: 1 8/12, 2nd number: 5/81
20/12 + 5/81 is 140/81.
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,
5/81 = 5 × 4/81 × 4 = 20/324 - Add the two like fractions:
540/324 + 20/324 = 540 + 20/324 = 560/324 - 560/324 simplified gives 140/81
- So, 20/12 + 5/81 = 140/81
In mixed form: 159/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+5/81 20/12+10/81 20/24+5/81 60/12+5/81 20/12+15/81 20/36+5/81 20/12+25/81 20/60+5/81 20/12+35/81 20/84+5/81