21 inch to cm

To convert 21 inches to centimeters, we will use the conversion factor that 1 inch is equal to 2.54 centimeters.

Step 1: Write down the conversion factor – 1 inch = 2.54 centimeters

Step 2: Set up the equation – 21 inches * (2.54 centimeters/1 inch)

Step 3: Cancel out the unit of inches on the top and bottom of the equation, leaving only the unit of centimeters.

Step 4: Multiply the numbers on the top and bottom of the equation – 21 * 2.54 = 53.34 centimeters

Step 5: Write the final answer with the appropriate units – 21 inches is equal to 53.34 centimeters.

Therefore, 21 inches is equivalent to 53.34 centimeters.