ANSWER
[tex]1: 10[/tex]
EXPLANATION
We want to simplify, the ratio 10,000 centimeters to 1000 meters.
Thus,
[tex]10,000cm:1000m[/tex]
We need to convert to the same unit and simplify.
Recall that,
[tex]100cm = 1m[/tex]
So the above ratio can be rewritten as,
[tex]100m:1000m[/tex]
Or
[tex]10,000cm:100,000cm[/tex]
We simplify now to get,
[tex]1:10[/tex]