In order of operations do you add them subtract

Add first then subtract
p parentheses
e exponents
m multiply
d divide
a add
s subtract

Yes, parenthesis, exponents, multiplication, division, addition, subtraction.
PEMDAS
Unless, subtraction comes first (on the left)
Example: 
1)
2+5*8-4
5*8 = 40
40+2 = 42
42-4 = 38

2) 4-5*8+9
5*8 = 40
40-4 = 36
36+9 = 45

Although sometimes you get the same answer from doing either first