Step 1: Start with the fraction 70/80.

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

70 ÷ 80 = 0.875

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

0.875 × 100 = 87.5%

Final Answer: 70/80 as a percentage is 87.5%.