1. Created by Mr. Lafferty Maths Dept.
Integers
Level 3
Add/Sub and Double Negatives
Multiply +ve / -ve Integers
Divide by +ve or -ve Integers
20-Apr-17
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
Level 3
20-Apr-17
Created by Mr. Lafferty Maths Dept.

3. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Level 3
Learning Intention
Success Criteria
1. To explain the ‘double negative’ for integers.
To understand the ‘double negative’ for integers.
2. To simplify and solve problems using the ‘double negative’ property.
20-Apr-17
Created by Mr. Lafferty Maths Dept.

4. Created by Mr. Lafferty Maths Dept24 22 20 14 18 16 12 10
Integers
Revision
Level 3
UP +
(a) = 16 8 6 4
Go up 4
Start at 12 2 -2
Down -
(b) 10 +(-8) = 2 -4 -6 -8
Start at 10
Go down 8
-24
-22
-20
-14
-18
-16
-12
-10
(c) = -3
Start at 7
Go down 10
20-Apr-17
Created by Mr. Lafferty Maths Dept

5. Created by Mr. Lafferty Maths Dept
Integers
Level 3
Examples
Remember
“+ -” = -
(1)
= -4
(2) 4 + (-9)
= -5
(3)
= -15
(4) (-12)
= -14
(5)
= -30
(6) 8 + (-9)
= -1
20-Apr-17
Created by Mr. Lafferty Maths Dept

6. “- -” = + Integers Double Negative 1 - (- 2) = 1 + 2 = 3 - 4 – (- 5) =
With your partner you have 30 second to the rule
Integers
Addition & Subtraction
Level 3
Double Negative
Rule
“- -” = +
1 - (- 2) =
1 + 2 = 3
- 4 – (- 5) = = 1
-3 - (- 5) = = 2
-1 - (- 10) = = 9
Practice
20-Apr-17
Created by Mr. Lafferty Maths Dept.

7. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Level 3
Now try Ex 3/4
First Column Only
Ch2 (page 14)
20-Apr-17
Created by Mr. Lafferty Maths Dept.

8. Created by Mr. Lafferty Maths Dept.
Starter Questions
Level 3
20-Apr-17
Created by Mr. Lafferty Maths Dept.

9. Created by Mr. Lafferty Maths Dept.
Integers
Multiplication & Division
Learning Intention
Success Criteria
1. Understand how to multiply positive and negative integers.
1. Explain how to multiply positive and negative integers.
20-Apr-17
Created by Mr. Lafferty Maths Dept.

10. Created by Mr. Lafferty Maths Dept.
With your partner can try and come up with the rules for multiplying integers
(+ve) x (+ve) = (+ve)
(-ve) x (–ve) = (+ve)
(-ve) x (+ve) = (-ve)
(+ve) x (–ve) = (-ve)
Integers
Multiplication & Division
Multiplying Integers
1 x (-2) = -2
(-2) x (-1) = 2
(-4) x 5 =
-20
(- 2) x (-5) = 10
(-3) x 3 = -9
(-5) x (-5) = 25
Same signs
= positive answer
Different signs
= negative answer
5 x (-8) =
-40
(-4) x (-8) = 32
20-Apr-17
Created by Mr. Lafferty Maths Dept.

11. Created by Mr. Lafferty Maths Dept.
Same signs
= positive answer
Different signs
= negative answer
Remember BODMAS
Integers
S33
Multiplication
Multiplying Integers
1 + (-2) x (-10) = 21
3 + (-5)2 = 28
8 – (-3)2 = -1
5 x (-2)2 + 5 – 19 = 6
20-Apr-17
Created by Mr. Lafferty Maths Dept.

12. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Level 3
Now try Exercise 5
Ch2 (page 17)
Q1 – Q6
20-Apr-17
Created by Mr. Lafferty Maths Dept.

13. Created by Mr. Lafferty Maths Dept.
Starter Questions
Level 3
20-Apr-17
Created by Mr. Lafferty Maths Dept.

14. Created by Mr. Lafferty Maths Dept.
Integers
Multiplication & Division
Level 3
Learning Intention
Success Criteria
1. Understand the ‘double negative’ for multiplying and dividing negative numbers.
1. To explain the double negative for multiplying and division.
2. Use double negative to solve problems.
20-Apr-17
Created by Mr. Lafferty Maths Dept.

15. Created by Mr. Lafferty Maths Dept.
With your partner can try and come up with the rules for multiplying integers
(+ve) ÷ (+ve) = (+ve)
(-ve) ÷ (–ve) = (+ve)
(-ve) ÷ (+ve) = (-ve)
(+ve) ÷ (–ve) = (-ve)
Integers
Multiplication & Division
Level 3
(-2) ÷ 1 = -2
(-2) ÷ (-1) = 2 4
20 ÷ (-5) = -4
(- 20) ÷ (-5) =
Same signs
= positive answer
Different signs
= negative answer
(-9) ÷ 3 = -3
(-9) ÷ (-3) = 3
(-25) ÷ 5 = -5
(-40) ÷ (-8) = 5
20-Apr-17
Created by Mr. Lafferty Maths Dept.

16. Created by Mr. Lafferty Maths Dept.
Remember BODMAS
Same signs
= positive answer
Different signs
= negative answer
Integers
Division
Level 3
Division Integers
1 + (-20) ÷ (-10) = 3
100 ÷ (-5)2 = 4
÷ (-3)2 = 96
-48 ÷ (6 - 2)2 + 5 = 2
20-Apr-17
Created by Mr. Lafferty Maths Dept.

17. Created by Mr. Lafferty Maths Dept.
Integers
Multiplication & Division
Level 3
Now try Exercise 5
Ch2 (page 18)
Q7 – Q10
20-Apr-17
Created by Mr. Lafferty Maths Dept.