Step 1: Start with the fraction 3/8.

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

3 ÷ 8 = 0.375

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

0.375 × 100 = 37.5%

Final Answer: 3/8 as a percentage is 37.5%.