Answers

Subtract 28/10 from 5/81

1^st number: 5/81, 2^nd number: 2 8/10

5/81 - 28/10 is -1109/405.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 10 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 81 × 10 = 810,
   5/81 = 5 × 10/81 × 10 = 50/810
3. Likewise, for the 2nd fraction, since 10 × 81 = 810,
   28/10 = 28 × 81/10 × 81 = 2268/810
4. Subtract the two like fractions:
   50/810 - 2268/810 = 50 - 2268/810 = -2218/810
5. After reducing the fraction, the answer is -1109/405

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