wat is the metric ladder? in order greatest to least?

I am unfamiliar with the term "metric ladder." However, I suspect it is the list of the prefixes. From
kilo
hecto
deca
unit
deci
centi
milli

Note that there are a number of prefixes both above and below those listed above.

Well you listed them in order. unit is the center where it just stays...
it goes:
Kilo
hecto
deca
------unit-----
deci
centi
milli

when going up the ladder you move the decimal left. such as. 1 cm= .1 dm.
When going down the ladder move the decimal right. ex: 1 cm= 10 mm

yes it is correct.

2m=0.02cm

3 meters

Kilo

hecto
deca
UNIt
deci
centi
milli

I think there might be a mistake in your conversion. Let's go through it step by step:

We start with 2 meters (2m) and we want to convert it to centimeters (cm).

To go from meters to centimeters, we need to move the decimal two places to the right because there are 100 centimeters in 1 meter.

So, moving the decimal two places to the right, we get:

2m = 200 cm

Therefore, 2 meters is equal to 200 centimeters, not 0.02 centimeters.