Step 1: Start with the fraction 18/7.

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

18 ÷ 7 = 2.5714

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

2.5714 × 100 = 257.14%

Final Answer: 18/7 as a percentage is 257.14%.