Larger Measurement from a millimeter

1 centimeter
(1 cm)

Remember, centi is the prefix meaning
1 one hundredth of the
base unit meter.
So, 1 one hundredth of a meter
(0.01 m) is simply written 1 cm

 Larger Measurement from a centimeter

1 meter
(1 m)

Remember meter is the
Base Unit for Length
and all other Units are
derived from it.
There are exactly 1000 millimeters
(1000 mm) in 1 meter (1 m)

Larger Measurement from a meter

1 kilometer
(1 km)

Remember, kilo is the prefix meaning 1000 times as much.
So, one thousand meters (1000 m)
being the length of 1 kilometer,
is simply written 1 km
which is pronounced
"KILL-oh-meet-ur" NOT
 "kill-AH-mit-ur"!