Stop right there! Right now on the Maths page on this blog is a great resource ready for you to download! Yes it is a chart explaining the King Henry strategy which employs the greek words kilo, hecto, deca, unit, deci, centi and milli to explain our measurement system and HELP YOU with ALL measurement conversions!
1km = 1000m
1m = 100cm
1cm = 10mm
Multiply when converting to the right (and move that decimal place accordingly)
Divide when converting to the left (and move that decimal place accordingly)