How do you rename fractions

So, let's see. For example let's say we need to convert 4/12 into simplest form. 4/12 divided by 4 is 1/3. There. I chose 4 cuz it's the simplest. Get it? If not, try watching YouTube. I recommend watching mathantics they have great videos.

You can change it to a decimal by dividing the numerator by denominator