Add 90/75 and 5/81
1st number: 1 15/75, 2nd number: 5/81
90/75 + 5/81 is 511/405.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 81 is 2025
Next, find the equivalent fraction of both fractional numbers with denominator 2025 - For the 1st fraction, since 75 × 27 = 2025,
90/75 = 90 × 27/75 × 27 = 2430/2025 - Likewise, for the 2nd fraction, since 81 × 25 = 2025,
5/81 = 5 × 25/81 × 25 = 125/2025 - Add the two like fractions:
2430/2025 + 125/2025 = 2430 + 125/2025 = 2555/2025 - 2555/2025 simplified gives 511/405
- So, 90/75 + 5/81 = 511/405
In mixed form: 1106/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75+10/81 90/75+15/81 90/75+25/81 90/75+35/81