Step 1: Start with the fraction 12/1.

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

12 ÷ 1 = 12.0

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

12.0 × 100 = 1200.0%

Final Answer: 12/1 as a percentage is 1200.0%.