A metal rod is 21 inches long. What is its length in centimetres, if 1 inch =2.54cm

The length of the metal rod in centimeters is 53.34 cm. (21 inches * 2.54 cm/inch = 53.34 cm)

To convert inches to centimeters, multiply the length in inches by the conversion factor of 2.54 cm/inch.

So, the length of the metal rod in centimeters would be:
21 inches × 2.54 cm/inch = 53.34 cm

Therefore, the length of the metal rod is 53.34 centimeters.

To convert inches to centimeters, you can use the conversion factor that 1 inch is equal to 2.54 centimeters.

So, to find the length of the metal rod in centimeters, you need to multiply the length in inches (21) by the conversion factor (2.54 cm/inch).

Let's calculate it step by step:

Length in centimeters = Length in inches × Conversion factor

Length in centimeters = 21 inches × 2.54 cm/inch

Now, multiply the numbers:

Length in centimeters = 53.34 cm

Therefore, the length of the metal rod is 53.34 centimeters.