Add 90/45 and 7/81
1st number: 2 0/45, 2nd number: 7/81
90/45 + 7/81 is 169/81.
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,
90/45 = 90 × 9/45 × 9 = 810/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
7/81 = 7 × 5/81 × 5 = 35/405 - Add the two like fractions:
810/405 + 35/405 = 810 + 35/405 = 845/405 - 845/405 simplified gives 169/81
- So, 90/45 + 7/81 = 169/81
In mixed form: 27/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/45+14/81 90/45+21/81 90/45+35/81 90/45+49/81