LO To understand the order of operations (BIDMAS)

21 Apr 2023

Starter Activity

Look at the four questions. In your pairs, decide which answer is correct. You must give a reason for your answer.

Starter Activity – Think / Pair / Share

6 + 7 x 2 =

2 x 6 + 10 ÷ 2 =

35 – 20 ÷ 5 + 6 =

24 + 8 ÷ 4 + 7 =

20 or 26?

11 or 17?

37 or 9?

33 or 15

BIDMAS – A quick Reminder

BID MA S

RACKETS

NDICES

IVISION ULTIPLICATION

DDITION UBTRACTION

Mini Whiteboard

Activity

Can you help Chief Clancy Wiggum work out who?

Someone in Springfield has robbed Kwik – e- mart?

You will have only 15 seconds to solve each clue…………..

Solve 3 + 4 x10

Solve (3 + 4) x 10

Solve: 5 +2 x 3 + 1

Solve: (5 +2) x 3 + 1

Solve: (5 +2) x (3 + 1)

Solve: 5 +2 x (3 + 1)

Solve: 6 + 9 ÷ 3

Solve: (6 + 9) ÷ 3

Solve: 12 – 3 + 25

Solve: 4 +{(7 - 4) x 2} 2

Now add up all the answers to identify the thief from the following

gallery…..

89170

209184

219

276

478

134

Homer Simpson

Dr. Hibbert

Side Show Bob

Smithers

Ned FlandersKrusty

Grandpa Patty

Did you correctly identify the robber?

3 + 4 x10 = 43(3 + 4) x 10 = 70

5+2x3+1 = 12(5+2)x3+1 = 22

(5+2)x(3+1) = 28

Solutions

5 + 2 x (3 + 1)= 136 + 9 ÷ 3 = 9

(6 + 9) ÷ 3 = 512 -3 + 52 = 34

22 +62 = 40

Total of all solutions: 276

Support - TaskDecide whether each of the statements below is true or false. If you think the statement is false you must say what you think the correct answer is.

(a)2 + 3 x 5 = 25

(b)4 x 5 + 2 = 22

(c)15 – 2 x 6 = 3

(d)3 + 4 x 2 = 14

(e)20 – 10 ÷ 2 = 15

(f)8 ÷ 2 + 3 = 7

(g)6 - 1 + 3 = 2

Calculation Target

2 + 3 x 4 + 5 29

2 + 3 x 4 + 5 45

2 x 3 + 4 x 5 26

2 x 3 + 4 x 5 46

2 x 3 + 4 x 5 50

2 x 3 + 4 x 5 70

2 + 3 x 42 80

2 + 3 x 42 146

2 + 3 x 42 196

2 + 3 x 42 400

Main Task

Show how you can reach each target by adding brackets to the calculations.

Extension Task

Look at the diagrams opposite and the calculations and solutions. on the next page.

Underneath each diagram write the calculation / calculations that it represents.

You should also write the solution.

Some of the solutions are missing, you must work these out.

Calculations Solution

1445.54948143.5

Plenary

The answer is 8, what is the question?

Easier Challenge

Include + and – in your calculation.

Harder Challenge

Include x, ÷ and brackets in your calculation.

Hardest Challenge

Include x, ÷ , brackets and indices in your calculation.