Answers

Subtract 25/81 from 3/80

3/80 - 25/81 is -1757/6480.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 81 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 80 × 81 = 6480,
   3/80 = 3 × 81/80 × 81 = 243/6480
3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
   25/81 = 25 × 80/81 × 80 = 2000/6480
4. Subtract the two like fractions:
   243/6480 - 2000/6480 = 243 - 2000/6480 = -1757/6480

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