Let me give u a few strats for division.
Strat 1: make a picture. You have 4 circles. You have to divide them by 2(ik this is simple) 


so you have 4 / 2 (/ is a sign for division) so you have 4 items and 2 groups. Put those items into each group
Group 1 group 2

. 

You have 2 groups of 2 also known as 2 x 2. You can do this with bigger groups but it will take longer.
I know I said I would give u 3 strats but I don't remember them mb. I've been using a calculator for so long I forgot how to do long divisiom