Step 1: Start with the fraction 64/80.

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

64 ÷ 80 = 0.8

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

0.8 × 100 = 80.0%

Final Answer: 64/80 as a percentage is 80.0%.