Question

How many decimetres are there in a decametre?

• A. 200
• B. 1000
• C. 400
• D. 100

Hint:

Remember the metric prefixes: \textbf{Deca-} means 10 times the base unit. \textbf{Deci-} means 1/10th of the base unit. This helps in quickly calculating conversions.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
This question involves converting between two units of length in the metric system: decametres and decimetres.
Step 2: Detailed Explanation
Let's break down the metric prefixes based on the base unit, the metre:
1 decametre (dam) = 10 metres (m)
1 metre (m) = 10 decimetres (dm)
To find how many decimetres are in a decametre, we can set up a conversion:
\[ 1 \text{ decametre} = 10 \text{ metres} \] Since each metre is equal to 10 decimetres, we can substitute:
\[ 1 \text{ decametre} = 10 \times (10 \text{ decimetres}) \] \[ 1 \text{ decametre} = 100 \text{ decimetres} \]