Study Notes 2.3 Order of Operations

Study Notes 2.3 Order of Operations

– When an equation comprises addition and subtraction only, we solve the operation from left to right.

E.g.

25 +67 – 9 = (25 + 67) – 9

= 92 – 9

= 83

– When an equation comprises multiplication and division only, we solve the operation from left to right as well

E.g

3 × 8 ÷ 6 =(3 × 8) ÷ 6

=24 ÷ 4

=4

– When an equation comprises all four operations , we solve the (+ – x ÷) operation by doing the multiplication OR division first followed by the addition OR subtraction from left to right .

E.g

70 + 4 × 3 − 7 = 70 + (4×3) −7

= 70 + 12 −7

= 82 -7

=75

 

-When an equation includes brackets, we do the operation inside the brackets first. Then we do the operations in the order as shown above.

E.g

66 −(10 × 4−16) +100 ÷5

=66 − (40−16) +(100 ÷5)

= 66 – ( 24 ) + ( 100÷ 5 )

=66 – 24 + 20

=62

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