Answers

Subtract 18/81 from 10/20

10/20 - 18/81 is 5/18.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   10/20 = 10 × 81/20 × 81 = 810/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   18/81 = 18 × 20/81 × 20 = 360/1620
4. Subtract the two like fractions:
   810/1620 - 360/1620 = 810 - 360/1620 = 450/1620
5. After reducing the fraction, the answer is 5/18

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