Step 1: Start with the fraction 45/100.

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

45 ÷ 100 = 0.45

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

0.45 × 100 = 45.0%

Final Answer: 45/100 as a percentage is 45.0%.