Answers

Subtract 70/81 from 54/80

54/80 - 70/81 is -613/3240.

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,
   54/80 = 54 × 81/80 × 81 = 4374/6480
3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
   70/81 = 70 × 80/81 × 80 = 5600/6480
4. Subtract the two like fractions:
   4374/6480 - 5600/6480 = 4374 - 5600/6480 = -1226/6480
5. After reducing the fraction, the answer is -613/3240

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