Can some one help me with science . I am having a difficult time .

Kilometer - km - 1,000
Hectameter - hm - 100
Decameter - dam - 10
Millimeter - mm - 0.001
The table provides clear prefix rules.
The prefixes can be used for most (if not all) units such as grams (kg,mg...).
Hello there i hope you are having a good day :) Answer :
Prefix with the base unit meter : Symbol : Number of meters :
. (kilometre) (Km) = 1000 m
. (Hectometre) (HM) = 100 m
. (Decameter) (Dam) = 10 meters
. (Millimetre) (mm) = 0.001 meters
Hopefully this help you :)