Answers

Add 21/25 and 4/81

21/25 + 4/81 is 1801/2025.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 81 is 2025
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2025
2. For the 1st fraction, since 25 × 81 = 2025,
   21/25 = 21 × 81/25 × 81 = 1701/2025
3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
   4/81 = 4 × 25/81 × 25 = 100/2025
4. Add the two like fractions:
   1701/2025 + 100/2025 = 1701 + 100/2025 = 1801/2025
5. So, 21/25 + 4/81 = 1801/2025

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