How many centimeters are there in 2 kilometers?

Hint:
Use the formula of conversion of meters to kilometers and centimeters to meters which are $1km = 1000m$ and $1m = 100cm$ to get the number of centimeters to kilometers. As $1m = 100cm$, convert $2000m$ into centimeters by multiplying it with 100.

Complete step by step solution:
From the question, we know that we have to find the number of centimeters that make two kilometers. So, we will use the formula of converting one unit to another unit.
We know that, one thousand meters make up one kilometer which can be expressed mathematically –
$1km = 1000m$
So, multiplying 2 in the above formula of converting meters to kilometers, we get –
$ \Rightarrow 2km = 2000m$
Hence, there are 2000 meters in 2 kilometers.
Now, we also know that, 100 centimeters make up 1 meter –
$1m = 100cm$
Therefore, multiplying 2000 in the above formula, we get –
$ \Rightarrow 2000m = 200000cm$
In the above equation, we can write 2000 meters equal to 2 kilo – meters, we get –
$ \Rightarrow 2km = 200,000cm$

Hence, there are 200,000 centimeters in 2 kilometers.

Note:
Centimeters, meters and kilometers all are the units of measuring of length or distances. The unit of length refers to any arbitrarily chosen and accepted reference standard of measurement of length. The S.I or International system of units of length or distance is meter. It is also the most common unit of length. - During the conversion of units, if the smaller unit is converted to larger unit then we should do the multiplication on the other hand, when the larger unit is to be converted to smaller unit then the division is done. Some other units of the measurement of the length are yards, miles, foots and inches.