Fix My Mistake
9 - 3 x 2 = 12
9 -3 x 2 = 3
Give the correct order of operations.
Brackets, Indices, Division, Multiplication, Addition & Subtraction
3 + 6 x 4
27
(14 + 6) x (12 -4) -9
151
Twice the sum of 7 and 5, divided by 4.
6
(2 × (7 + 5) ÷ 4)
10÷5 x 2 = 1
10÷5 x 2 = 4
What is included in 'Indices'?
• Powers (e.g. 37, 54)
• Squares (e.g. 72)
• Cubes (e.g. 23)
• Square roots (√16)
25 ÷ 5 -2
3
(15 - 5) x 10 + 3
103
y- axis
5 x 5 +1 = 30
5 x 5 + 1= 26
What does it mean to 'evaluate'?
To solve the expression - solve the final answer.
12 - 8 ÷ 2 + 3
11
6 x 8 + ( 7 - 6 )
49
(36 × 24) + 18
882
4 + 5 + 7 - 3 x 2 = 26
4 + 5 + 7 - 3 x 2 = 10
If an expression has multiplication and division only, in what order should I complete them?
left to right
20 ÷ (8-3) + 16
20
( 10 + 19 -5 ) x 2
48
The square of 5 plus 3.
28
( 5² + 3 )
The problem was 20 - 5 x 2 + 3. My answer was 33. What did I do wrong?
I did not multiply first. The answer should be 13.
A student solves
18 ÷ 3 × 2
and says the answer is 3 because they divided first and stopped.
What mistake did they make?
They didn’t continue working left to right. Division and multiplication are done from left to right.
7 + 3 x (8 ÷ 4)
13
2 x ( 9 x 9 + 2) - 8
158
9 x 1
9