Step 1: Start with the fraction 81/16.

Step 2: To convert a fraction into a percentage, divide the numerator by the denominator.

81 ÷ 16 = 5.0625

Step 3: Multiply the result by 100 to get the percentage.

5.0625 × 100 = 506.25%

Final Answer: 81/16 as a percentage is 506.25%.