Question

How many meters is 120 cm?

Answer 1

$$120.cm=1.20.m$$
Explanation:
$$1.cm=1 \times 10^{-2}.m$$
Thus $$120.cm=120 \times 1 \times 10^{-2}.m =120.m$$
Centi, micro, milli, and kilo are simply commonly used multipliers to save on the number of $$0000's$$ we have to write.
Micro $$(\mu)$$ means $$\times 10^{-6}$$
Milli $$(m)$$ means $$\times 10^{-3}$$
Kilo $$(k)$$ means $$\times 10^{3}$$
Mega $$(m)$$ means $$\times 10^{6}$$
Deci means $$\times 10^{-6}$$