Step 1: Start with the fraction 45/80.

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

45 ÷ 80 = 0.5625

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

0.5625 × 100 = 56.25%

Final Answer: 45/80 as a percentage is 56.25%.