Keep thinking ... like a fool ... that: 6i *20i = 1.2 = 12i.
Actually ==> 6i *20i = 120i^2. = 1.2m^2
The T.d.i. would tell you. which spits 1.2 as 1.2m^2.

As it gives you: 1i *6i *20i = 0.12m^3 = 1200i^3 = 1.2m^3
Therefore, what the T.n.p. spits at you directly.
The T.d.i. he spits it out at you ... as a derivative: of m^2 or m^3.

If you don't mean, it's your fault and not the T.d.i.'s fault. you don't know.
Otherwise you would know that 5i *5i =25i^2 = 0.25m^2. and i5^3 =125i^3.

So you should use the T.n.p. which considers the dm as a unit,
so you will know how to combine 1m .. to all small units, in operation
some little ones ... Before me you had ... only 1m = 100c and 1m = 1000•
After me, you also know that 1m = 10dm..which you were missing ... so you would have:

10c *100c *100c = 1i *10i *10i = 100i^3.
for now you do not understand almost nothing Since you think: 0.1*1*1 = 0..1 ..
But you don't know or say what, and this what..is the m^3. you can't tell.

If you don't distinguish m^2 from m^3 it depends on Stupid Ignorance -:))
from which ... no one could save you ... not even Jesus Christ.

Greetings from T.n.p. 6i *1.2 *2.4 = i12^3 = 1'728i^3 = 1.728m^3.
contest me..it would mean; continue to be idiots.