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Maths

Order of operation

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Practising using BIDMAS

Brackets, Indices, Division and Multiplication, Addition and Subtraction

Try and find the answers to these questions.

Question

Q1. Work out the value of the following:

a) 4 × 5 - 3 × 2

b) (2 + 3) × (5 - 1)

c) 2 + 6 ÷ 2

d) 8 - (6 - 1)

e) 3 × (4 + 2)

Answer

a) In BIDMAS multiplication comes before subtraction, so work out the multiplication first and then do the subtraction:
4 × 5 - 3 × 2 = 20 - 6 = 14

b) 20
The working is (2 + 3) × (5 - 1) = 5 × 4 = 20

c) In BIDMAS division comes before addition, so 2 + 6 ÷ 2 = 2 + 3 = 5

d) Brackets come first, so 8 - (6 - 1) = 8 - 5 = 3

e) BIDMAS states that brackets come before multiplication, so work out the bracket first: 3 × (4 + 2) = 3 × 6 = 18

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