Add 20/45 and 12/81
20/45 + 12/81 is 16/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 45 × 9 = 405,
20/45 = 20 × 9/45 × 9 = 180/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
12/81 = 12 × 5/81 × 5 = 60/405 - Add the two like fractions:
180/405 + 60/405 = 180 + 60/405 = 240/405 - 240/405 simplified gives 16/27
- So, 20/45 + 12/81 = 16/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45+12/81 20/45+24/81 20/90+12/81 60/45+12/81 20/45+36/81 20/45+60/81 20/45+84/81