Question

What is 0.12 divided by 1?

Answer 1

`0.12`

Explanation:

Every number divided by `1` remains unchanged!

You may justify this using the fact that `1` is the neutral element for multiplication, id est

`a \cdot 1 = a` for every number `a`

For example, `5 \cdot 1 = 5`

Now, in general, we know how to invert multiplication and turn them into divisions:

`5 \cdot 3 = 15 \implies 15 \div 3 = 5`

So, with one, it works like this:

`a \cdot 1 = a \implies a \div 1 = a`

Answer 2

`0.12`

Explanation:

Anything divided by `1` will equal to itself, because multiply anything by `1` will give out the exact same result.

`:.0.12-:1=0.12`