So like 13 / 2 is 13 divided by 2 and is 6 remainder 1.
You can write this as 6 1/2.
1/2 is 0.5
So 13/2 is 6.5
Or when you divide, do not stop at the units digit. Add 1 zero for every until the remainder is zero and divide. And add a decimal point for the first extra zero.