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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.