How to convert from cm to mm?

This may provide some reasoning for you:

1m (metre) = 100cm (centimetres) - 'cent' is latin for 'hundred' - and there's one hundred centimetres in a metre

1cm = 10mm (millimetres) - 'milli' is latin for 'thousand' (millenium? - thousand years?) - and there are 1000mm in 1m.

It is easy to convert between metric units. Use a power of 10. -mm to cm: divide by 10 -cm to mm: multiply by 10 -cm to inches: This one's a bit tougher, since you're converting from metric to customary units. There are 2.54 cm in 1 inch, so to go from cm to inches, divide by 2.54

1 cm = 10 mm

10mm = 1 cm

X by 10

2 cm = 20 mm

You have to Simply multiply the cm by 10 and you will get mm.
e.g. 2cm = 20 mm

cm = 10 mm
hahaha just google it or look at your ruler dude! hahaha
so 2cm is 20 mm!

1 cm = 10 mm
2 cm = 2 x 10 mm = 20 mm

Look at a ruler! 1 cm = 10 mm.
2 cm = 20 mm.

there are 10 mm in 1 cm.

Just like there is 12 months in 1 year. You know how many months are in 5 years, right? So you can figure out how many mm are in 2 cm.