Step 1: Start with the fraction 51/4.

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

51 ÷ 4 = 12.75

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

12.75 × 100 = 1275.0%

Final Answer: 51/4 as a percentage is 1275.0%.