Step 1: Start with the fraction 18/13.

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

18 ÷ 13 = 1.3846

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

1.3846 × 100 = 138.46%

Final Answer: 18/13 as a percentage is 138.46%.