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Order of Operations
93
Order of Operations
Order of Operations
BIDMAS
Mathematical equations and sums have to be completed in a particular order. We can't always work from left to right!
Lesson Plan
This presentation will cover
Ordering sums
Lesson Plan
What to do first
How to work out complicated equations
BIDMAS
BIDMAS
The order we complete equations in is as follows:
Brackets
Indices
Division
Multiplication
Addition
Subtraction
Question
Ordering equations
5 + 8 x 2 = 26
5 + 8 x 2 = 21
Which is correct? How do we know?
16 - 3 x 4
Steps
Example 1
3 x 4 = 12
16 - 12 = 4
1.
Look for brackets and indices - are there any?
2.
Division and Multiplication next
3.
Replace the equation and complete the sum!
6 + (3 x 4 + 2) - 8
Steps
Example 2
3 x 4 + 2
3 x 4 = 12
12 + 2 = 14
6 + 14 - 8
6 + 14 = 20
20 - 8 = 12
Brackets first - remember BIDMAS
1.
2.
Replace the brackets with the answer
Complete the equation!
3.
Steps
Example 3
12 - 2 x 5
2 x 5 = 10
12 - 10 = 2
3 x 3 = 9
9 + 2 = 11
Brackets first - remember BIDMAS
1.
2.
Indices next - times by itself
Complete the equation!
3.
Practice
Have a go at the question below
(4 x 3 + 2 x 8) - 9 + 4
Remember BIDMAS
a,
b,
You shouldn't need a calculator
?
23
!
Brackets first - 4 x 3 = 12, 2 x 8 = 16. 12 + 16 = 28
28 - 9 = 19 + 4 = 23.
Homework
Email if you get stuck!