Step 1: Start with the fraction 66/70.

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

66 ÷ 70 = 0.9429

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

0.9429 × 100 = 94.29%

Final Answer: 66/70 as a percentage is 94.29%.