The change of units from cm to m gives:
2.5cm = 0.025m
Where we used the ratio: 100cm = 1m.
Which ratio should we use to convert 2.5 cm to meters?
First, we know that:
100cm = 1m
Now, if we want to go from cm to m, then we need to have the unit on the cm side.
To get that, we can divide both sides by 100.
1cm = (1/100)m.
Now that we know how many meters are in one cm, we can rewrite:
2.5cm = 2.5*(1 cm) = 2.5*( (1/100) m) = (2.5/100)m = 0.025 m
The ratio used is the one in option D:
100 cm = 1m.
If you want to learn more about changes of units:
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