Converting from one metric unit to another

Kilo means 1000, so 1km = 1000m

centi mean 1/100th, so 1 cm = 1/100th m

milli means 1/1000th, so 1mm = 1/1000th m

Example:
A packet of biscuits weighs 150g. Find the weight of 12 packets of biscuits:
1. in g
2. in kg