Step 1: Start with the fraction 21/25.

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

21 ÷ 25 = 0.84

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

0.84 × 100 = 84.0%

Final Answer: 21/25 as a percentage is 84.0%.