Step 1: Start with the fraction 99/100.

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

99 ÷ 100 = 0.99

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

0.99 × 100 = 99.0%

Final Answer: 99/100 as a percentage is 99.0%.