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The metre (UK), or meter (International), symbol 'm', is the base unit of length or distance in the metric system.

The length of a meter was originally calculated to be the distance from the North Pole to the equator, but was later redefined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." (the speed if light is 299,792,458 m/s which is where that number came from.)

To measure smaller or greater distances, we generally add prefixes to simplify the numbers.

kilo- (k-) - 1000x

hecto- (h-) - 100x (rarely used)

deca- (da-) - 10x (rarely used)

deci- (d-) - 1/10x (not as rare, but still not really used in everyday conversation)

centi- (c-) - 1/100x

milli- (m-) - 1/1000x

Therefore:

10hm = 1km

10dam = 1hm

10m = 1dam

10dm = 1m

10cm = 1dm

10mm = 1cm

or...

1km = 1000m

100cm = 1m

and so on.

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