LO To understand the order of operations BIDMAS
LO To understand the order of operations (BIDMAS) 26 -Oct-20 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 = 20 or 26? 2 x 6 + 10 ÷ 2 = 11 or 17? 35 – 20 ÷ 5 + 6 = 37 or 9? 24 + 8 ÷ 4 + 7 = 33 or 15
BIDMAS – A quick Reminder B RACKETS I NDICES D IVISION A DDITION M ULTIPLICATION S UBTRACTION
Mini Whiteboard Activity You are going to be asked 10 questions. You must keep a record of each answer as you need to add all 10 answers together at the end of the activity
Someone in Springfield has robbed Kwik – e- mart? Can you help Chief Clancy Wiggum work out who?
You will have only 15 seconds to solve each clue…………. .
Solve 3 + 4 x 10
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…. .
Grandpa Patty 219 170 Smithers Ned Flanders 89 478 Side Show Bob Homer Simpson 134 Krusty Dr. Hibbert 184 276 209
Did you correctly identify the robber?
Solutions 3 + 4 x 10 = 43 (3 + 4) x 10 = 70 5+2 x 3+1 = 12 (5+2)x 3+1 = 22 (5+2)x(3+1) = 28 5 + 2 x (3 + 1)= 13 6+9÷ 3=9 (6 + 9) ÷ 3 = 5 12 -3 + 52 = 34 22 +62 = 40 Total of all solutions: 276
Support - Task Decide 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
Main Task Show you can reach target by adding brackets to the calculations. 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
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 144 5. 5 49 48 14 3. 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.
- Slides: 26