Answers

Subtract 56/81 from 45/90

45/90 - 56/81 is -31/162.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 81 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 90 × 9 = 810,
   45/90 = 45 × 9/90 × 9 = 405/810
3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
   56/81 = 56 × 10/81 × 10 = 560/810
4. Subtract the two like fractions:
   405/810 - 560/810 = 405 - 560/810 = -155/810
5. After reducing the fraction, the answer is -31/162

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