80:4:2:5= 80:4:2:5= 80:4:2:5=
According to the rules of the order of operations we should first solve the exercise from left to right since it only contains a division operation:
80:4=20 80:4=20 80:4=20
20:2=10 20:2=10 20:2=10
10:5=2 10:5=2 10:5=2
2