Answers

Subtract 8/81 from 42/80

42/80 - 8/81 is 1381/3240.

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,
   42/80 = 42 × 81/80 × 81 = 3402/6480
3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
   8/81 = 8 × 80/81 × 80 = 640/6480
4. Subtract the two like fractions:
   3402/6480 - 640/6480 = 3402 - 640/6480 = 2762/6480
5. After reducing the fraction, the answer is 1381/3240

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