What is 0.12 divided by 1?

May 4, 2018

$0.12$

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

$a \setminus \cdot 1 = a$ for every number $a$

For example, $5 \setminus \cdot 1 = 5$

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

$5 \setminus \cdot 3 = 15 \setminus \implies 15 \setminus \div 3 = 5$

So, with one, it works like this:

$a \setminus \cdot 1 = a \setminus \implies a \setminus \div 1 = a$

May 4, 2018

$0.12$

Explanation:

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

$\therefore 0.12 \div 1 = 0.12$