Add 70/75 and 28/81
70/75 + 28/81 is 518/405.
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,
70/75 = 70 × 27/75 × 27 = 1890/2025 - Likewise, for the 2nd fraction, since 81 × 25 = 2025,
28/81 = 28 × 25/81 × 25 = 700/2025 - Add the two like fractions:
1890/2025 + 700/2025 = 1890 + 700/2025 = 2590/2025 - 2590/2025 simplified gives 518/405
- So, 70/75 + 28/81 = 518/405
In mixed form: 1113/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/75+56/81 70/75+84/81