Add 20/4 and 15/81
1st number: 5 0/4, 2nd number: 15/81
20/4 + 15/81 is 140/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 4 × 81 = 324,
20/4 = 20 × 81/4 × 81 = 1620/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
15/81 = 15 × 4/81 × 4 = 60/324 - Add the two like fractions:
1620/324 + 60/324 = 1620 + 60/324 = 1680/324 - 1680/324 simplified gives 140/27
- So, 20/4 + 15/81 = 140/27
In mixed form: 55/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/4+15/81 20/4+30/81 20/8+15/81 60/4+15/81 20/4+45/81 20/12+15/81 20/4+75/81 20/28+15/81