1. Created by Mr. Lafferty Maths Dept
Negative Numbers
Integers – Positive and Negative
Add /Sub using Thermometer
Add / Sub Mathematically
Negative Coordinate Grid
5-Apr-17
Created by Mr. Lafferty Maths Dept

2. Created by Mr. Lafferty Maths Dept
Starter Questions
Q1. Calculate
Q2. How many euros do I get for £20 if
exchange rate is £1  1.5 €
Q3. What is the time difference 09:28 and 10:50
Q4. The answer to the question is 90. What is the
question.
5-Apr-17
Created by Mr. Lafferty Maths Dept

3. Created by Mr. Lafferty Maths Dept
Negative Numbers
Addition & Subtraction
Learning Intention
Success Criteria
1 We are learning how to add positive and negative numbers.
Understand how to add and subtract both positive and negative integers using a thermometer.
5-Apr-17
Created by Mr. Lafferty Maths Dept

4. Created by Mr. Lafferty Maths Dept
Integers
Definition : An INTEGER is a negative or positive
whole number, including 0.
e.g. -2, -1, 0, 5, 100
Note : -2.5, -1.2, 23.5
Are NOT INTEGERS
Write down 3 places where negative numbers are used
Interpreting negative numbers
Ex1 Page 59 Round Class
5-Apr-17
Created by Mr. Lafferty Maths Dept

5. Created by Mr. Lafferty Maths Dept
Negative
Numbers 24 22 20 14 18 16 12 10
UP +
(a) 4oC up from 12 o C 8
= 16 6 4
(b) 8oC down from 10 o C 2
= 2 -2
Down -
(c) 3oC up from -2 o C -4
= 1 -6 -8
(d) 6oC down from 2 o C
-24
-22
-20
-14
-18
-16
-12
-10
2 - 6 = -4
5-Apr-17
Created by Mr. Lafferty Maths Dept

6. Created by Mr. Lafferty Maths Dept
Negative Numbers
Your turn !
Page 61 Exercise 2
5-Apr-17
Created by Mr. Lafferty Maths Dept

7. Created by Mr. Lafferty Maths Dept
Starter Questions
Q1. Calculate
Q2. How many euros do I get for £10 if
exchange rate is £1  1.4 €
Q3. What is the time difference 09:45 and 20:30
Q4. The answer to the question is 30. What is the
question.
5-Apr-17
Created by Mr. Lafferty Maths Dept

8. Created by Mr. Lafferty Maths Dept
Negative Numbers
Addition & Subtraction
Learning Intention
Success Criteria
1 We are learning how to write down mathematically addition and subtraction of negative integers.
To be able to write down mathematically the addition and subtraction of both positive and negative integers.
5-Apr-17
Created by Mr. Lafferty Maths Dept

9. Created by Mr. Lafferty Maths Dept
Negative
Numbers 24 22 20 14 18 16 12 10
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
5-Apr-17
Created by Mr. Lafferty Maths Dept

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

11. Created by Mr. Lafferty Maths Dept
Negative Numbers
Your turn !
Page 61 Exercise 2
Q1 and Q2
5-Apr-17
Created by Mr. Lafferty Maths Dept

12. Created by Mr. Lafferty Maths Dept
Starter Questions
5-Apr-17
Created by Mr. Lafferty Maths Dept

13. Created by Mr. Lafferty Maths Dept
Coordinates
Extending the Grid – Negative Numbers
Learning Intention
Success Criteria
Remember the main parts of a coordinate grid.
1. We are learning how we can extend the coordinate grid to include negative numbers.
2. Understand the negative grid both in y-axis direction and x-axis direction.
5-Apr-17
Created by Mr. Lafferty Maths Dept

14. Coordinates www.mathsrevision.com
Extending the Grid – Negative Numbers
We can further extend the negative grid
y - axis
Plot the point
(-2,2) 3
x-coordinate is -2 2 1
y-coordinate is 2 -4 -3 -2 -1 1 2 3 4
x - axis -1
(-4,-2) -2 -3
x-coordinate is -4
y-coordinate is -2
Write down coordinates
of the other points
5-Apr-17
Created by Mr. Lafferty Maths Dept

15. Created by Mr. Lafferty Maths Dept
Coordinates
Extending the Grid
Now try Exercise 4
Ch5 (page 64)
5-Apr-17
Created by Mr. Lafferty Maths Dept