Sequence of Operations - Basic Mathematics for Water and Wastewater Operators - page 93

■ Example 3.6
Problem : Perform the following operation:
-1 + (-1) × -3
Solution : Multiplication and division must be done before addition and subtraction.
(-1) × -3 = 3
-1 + 3 = 2
■ Example 3.7
Problem : Perform the following operation:
2 × (-3) + 4
Solution : Multiplication and division must be done before addition and subtraction.
2 × (-3) = -6
-6 + 4 = -2