Answers

Add 25/35 and 20/81

25/35 + 20/81 is 545/567.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 35 and 81 is 2835
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2835
2. For the 1st fraction, since 35 × 81 = 2835,
   25/35 = 25 × 81/35 × 81 = 2025/2835
3. Likewise, for the 2nd fraction, since 81 × 35 = 2835,
   20/81 = 20 × 35/81 × 35 = 700/2835
4. Add the two like fractions:
   2025/2835 + 700/2835 = 2025 + 700/2835 = 2725/2835
5. 2725/2835 simplified gives 545/567
6. So, 25/35 + 20/81 = 545/567

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