rules find 1/4 of the input

Question

find 1/8 of the input

input output
16 ___
20 ____
80 ____
32 ____
40 ____
18 ____

Answer 1

is there a problem with finding 1/4 or 1/8 of the values shown?

16/4 = 4
16/8 = 2

and so on