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If you run all the way around a standard school running track, you cover exactly 400400 meters.
How many tracks would you have to run to complete a 5 km5\text{ km} road race, and how do we write track laps as part of a kilometer?

The Kilo- Connection

The prefix kilo- comes from the Greek word khilioi, which means one thousand.
Because 1 kilometer=1,000 meters1\text{ kilometer} = 1{,}000\text{ meters}, every meter is one-thousandth (11,000\frac{1}{1{,}000}) of a kilometer, written in decimals as 0.001 km0.001\text{ km}.
How do we convert any meter measurement into kilometers using this thousandth relationship?

Meters to Kilometers

To change meters to kilometers, we divide by 1,0001{,}000, which moves the decimal point three places to the left.
For example, to convert 3,750 m3{,}750\text{ m}, start with the decimal at the end (3750.3750.) and slide it 3 places left to get 3.75 km3.75\text{ km}.
What happens if our meter count has fewer than three digits, like 45 meters45\text{ meters}?

Using Zero as a Place Value Holder