Six. With multiplication (an all other functions) you always go left to right unless there are mixed functions (addition, subtraction, division, multiplication). Then you need to follow the rules for order of operations (BEDMAS).
B - Brackets - do whatever is in brackets first
E - Exponents - work out all exponents before you do other functions
D - Division - work out all division before continuing to do any new steps
M - Multiplication - work it all out before continuing any new steps
A - Addition - work out all addition before continuing any new steps
S - Subtraction - work out all subtraction and then you're done
B - Brackets - do whatever is in brackets first
E - Exponents - work out all exponents before you do other functions
D - Division - work out all division before continuing to do any new steps
M - Multiplication - work it all out before continuing any new steps
A - Addition - work out all addition before continuing any new steps
S - Subtraction - work out all subtraction and then you're done