Answers

Subtract 21/25 from 7/81

7/81 - 21/25 is -1526/2025.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 25 is 2025
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2025
2. For the 1st fraction, since 81 × 25 = 2025,
   7/81 = 7 × 25/81 × 25 = 175/2025
3. Likewise, for the 2nd fraction, since 25 × 81 = 2025,
   21/25 = 21 × 81/25 × 81 = 1701/2025
4. Subtract the two like fractions:
   175/2025 - 1701/2025 = 175 - 1701/2025 = -1526/2025

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