When converting up/down in measurements...?

Question

Should I multiply or divide when I convert up a measurement. For example, A meter to a Kilometer.

And vice-versa the other way?

Answer 1

multiply

Answer 2

You cannot convert a meter to a kilometer. A meter is only one thousandth of a kilometer.

1 m = 1/1000 km = 0.001 km

2500 m = 2500/1000 km = 2.5 km

Answer 3

to convert up a measurement, you divide, because you will get less of the bigger unit.

to convert down a measurement, you multiply, because you will get more of the smaller unit.