how many decimeters are there in:

a meter:

a decameter:

a kilometer:

10

100

10000

To determine how many decimeters are in a given length, you need to understand the metric system prefixes.

In the metric system, "deci-" is a prefix that represents a factor of 1/10 or 0.1. So, to convert a length to decimeters, you would multiply it by 10.

Let's calculate the number of decimeters in each length:

1. A meter:
To convert a meter to decimeters, multiply it by 10:
1 meter * 10 = 10 decimeters

Therefore, there are 10 decimeters in a meter.

2. A decameter:
To convert a decameter to decimeters, multiply it by 10:
1 decameter * 10 = 10 decameters

Therefore, there are 10 decimeters in a decameter.

3. A kilometer:
To convert a kilometer to decimeters, multiply it by 10:
1 kilometer * 1000 = 10000 decimeters

Therefore, there are 10000 decimeters in a kilometer.

In summary, there are 10 decimeters in a meter, 10 decimeters in a decameter, and 10000 decimeters in a kilometer.