1. LO Using pictures to represent directed number calculations. RAG
Key Words: Positive, Negative, Infinite
28-Nov-18
Which of these statements is the odd one out? Why ?
“Any number multiplied by zero equals zero.”
“Multiplying by ½ is the same as dividing by 2.”
“When you multiply any number by 10 you add a zero to the end of the number.”

2. Mini white boards ready…

3. This diagram represents an infinite number of positive and negative charges cancelling each other out….

4. Start by drawing a set of positive and negative charges, in pairs so that they cancel each other out….

5. How could we represent (+2) + (-3) ?

6. How could we represent (+2) + (-3) ?
(+2) + (-3) = -1

7. How could we represent (+2) - (-3)

8. How could we represent (+2) - (-3)
(+2) - (-3) = 5

9. How could we represent (-2) - (-4)?

10. (-2) - (-4) = +2

11. An infinite number or positive and negative charges
How could we represent (-3) x (+2) ?

12. An infinite number or positive and negative charges
(-3) x (+2) = -6

13. An infinite number of positive and negative charges cancelling each other out….
How we would represent (-3) x (-2)?

14. An infinite number of positive and negative charges cancelling each other out….
(-3) x (-2) = +6

15. Today’s Task
Draw pictures to represent the calculations below:- Have you noticed any patterns / rules. Can you describe them? Can you predict what the answers to the following calculations would be? (-35) ÷ (5) = (+12) ÷ (-4) = (-6) ÷ (-3) =
Easier
Harder
Hardest
(+2) + (-6) =
(+2) – (-5) =
(-2) x (+ 4) =
(-2 + (+5) =
(+3) – (-4) =
(-4) x (+ 2) =
(-5) – (+3)=
(-5) – (-2) =
(-2) x (-3) =
(-4) + (-5) =
(-6) – (-4) =
(-2) x (-4) =

19. YEAR 8 TASK

20. Class Discussion – What did you notice?