1. Created by Mr. Lafferty Maths Dept.
Integers
Add / Subtract Integers
Double Negatives
Multiply +ve / -ve Integers
Divide by +ve or -ve Integers
18-Apr-19
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
18-Apr-19
Created by Mr. Lafferty Maths Dept.

3. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Learning Intention
Success Criteria
1. To understand how to add positive and negative numbers using the thermometer as an aid.
To be able to do add and subtract both positive and negative integers.
18-Apr-19
Created by Mr. Lafferty Maths Dept.

4. Created by Mr. Lafferty Maths Dept.
Integers 4 3 2 1 -1 -2 -3
Addition & Subtraction
1 + 3 = 4
Think
Thermometer
4 - 5 = -1 = 2 = -3
18-Apr-19
Created by Mr. Lafferty Maths Dept.

5. Created by Mr. Lafferty Maths Dept.
Integers
Now try Exercise 3
Ch2 (page 14)
18-Apr-19
Created by Mr. Lafferty Maths Dept.

6. Created by Mr. Lafferty Maths Dept.
Starter Questions
18-Apr-19
Created by Mr. Lafferty Maths Dept.

7. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
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.
18-Apr-19
Created by Mr. Lafferty Maths Dept.

8. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Rule
- - = +
When side by side
“Two negatives make
a positive”
Double Negative
1 - (- 2) =
1 + 2 = 3
- 4 – (- 5) = = 1
-3 - (- 5) = = 2
-1 - (- 10) = = 9
18-Apr-19
Created by Mr. Lafferty Maths Dept.

9. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Now try Exercise 4
Ch2 (page 15)
18-Apr-19
Created by Mr. Lafferty Maths Dept.

10. Created by Mr. Lafferty Maths Dept.
Starter Questions
18-Apr-19
Created by Mr. Lafferty Maths Dept.

11. 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.
18-Apr-19
Created by Mr. Lafferty Maths Dept.

12. Integers Rule +ve x -ve = -ve +ve ÷ -ve = -ve Multiplying Integers
Multiplication & Division
Rule
+ve x -ve = -ve
+ve ÷ -ve = -ve
Multiplying / Dividing
“A positive x a negative
gives a negative answer”
“A positive ÷ a negative
Multiplying Integers
1 x (-2) = (-2)
(-2) ÷ 1 = -2
(-4) x 5 = -20
(- 20) ÷ 5 = -4
(-3) x 3 = -9
15 ÷ (-5) =-3
5 x (-8) = -40
40 ÷ (-8) = -5
18-Apr-19
Created by Mr. Lafferty Maths Dept.

13. Created by Mr. Lafferty Maths Dept.
Integers
Multiplication & Division
Now try Exercise 5
Ch2 (page 17)
Q1 – Q6
18-Apr-19
Created by Mr. Lafferty Maths Dept.

14. Created by Mr. Lafferty Maths Dept.
Starter Questions
18-Apr-19
Created by Mr. Lafferty Maths Dept.

15. Created by Mr. Lafferty Maths Dept.
Integers
Multiplication & Division
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.
18-Apr-19
Created by Mr. Lafferty Maths Dept.

16. Integers Rule -ve x -ve = +ve -ve ÷ -ve = +ve Multiplying / Dividing
Multiplication & Division
Rule
-ve x -ve = +ve
-ve ÷ -ve = +ve
Multiplying / Dividing
“A negative x a negative
gives a positive answer”
“A negative ÷ a negative
(-2) x (-1) = 2
(-2) ÷ (-1) = 2
(-4) x (-5) = 20
(- 20) ÷(-5) = 4
(-3) x (-3) = 9
(-9) ÷ (-3) =3
(-5) x (-8) = 40
(-40) ÷ (-8) =5
18-Apr-19
Created by Mr. Lafferty Maths Dept.

17. Created by Mr. Lafferty Maths Dept.
Integers
Multiplication & Division
Now try Exercise 5
Ch2 (page 18)
Q7 – Q10
18-Apr-19
Created by Mr. Lafferty Maths Dept.