Add 15/45 and 20/81
15/45 + 20/81 is 47/81.
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,
15/45 = 15 × 9/45 × 9 = 135/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Add the two like fractions:
135/405 + 100/405 = 135 + 100/405 = 235/405 - 235/405 simplified gives 47/81
- So, 15/45 + 20/81 = 47/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/45+20/81 15/45+40/81 15/90+20/81 15/45+60/81 75/45+20/81