Add 40/45 and 20/81
40/45 + 20/81 is 92/81.
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,
40/45 = 40 × 9/45 × 9 = 360/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Add the two like fractions:
360/405 + 100/405 = 360 + 100/405 = 460/405 - 460/405 simplified gives 92/81
- So, 40/45 + 20/81 = 92/81
In mixed form: 111/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/45+20/81 40/45+40/81 40/90+20/81 40/45+60/81