Well firstly 4 is 4/1 so now it would be
4/1 divided by 1/2
Your gonna use kir which stands for keep the first fraction, inverse the division symbol into multiplication symbol and then reciprocal so it changes to 2/1
So now it would be 4/1 multiplied by 2/1
Which is 8/1 which is also improper so you use TIBO
Stands for top in bottom out
So 8 divided by 1=
8 as your final answer