1. Created by Mr. Lafferty Maths Dept
Integers
Integers in Context
Integers Using a Thermometer
Adding & Subtracting Integers
10-Jun-18
Created by Mr. Lafferty Maths Dept

2. Created by Mr.Lafferty Math Dept
Starter Questions
Solve h – 3 = 18
x 7
3. Show an example of an acute angle.
10-Jun-18
Created by Mr.Lafferty Math Dept

3. Created by Mr. Lafferty Maths Dept
Integers
Learning Intention
Success Criteria
1 We are learning how to use integers in context.
Understand how integers are used in real-life.
10-Jun-18
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 Integers are used
Bank
Sea-Level
Height
Weather
10-Jun-18
Created by Mr. Lafferty Maths Dept

5. Created by Mr. Lafferty Maths Dept
Write down the temperature indicated on the thermometer.
44oF
7oF
-36oF
-43oF
10-Jun-18
Created by Mr. Lafferty Maths Dept

6. Created by Mr. Lafferty Maths Dept
Context Questions
A weather station predicted the temperature on Saturday would be 85°F.
If the actual temperature was 11° colder than their prediction,
what temperature was it?
85 – 11 = 74oF
Sarah set the thermostat in her house to 72°F, which was 16° cooler than the temperature outside.
What temperature was it outside?
= 88oF
Sarah bank account showed that she has £150.
If she withdraws £210 from her account.
What will her balance show up as now.
= -£60.00
John balance shows -£70. He pays a bill of £80 with his debit card and then his pay of £240 was paid into his account.
What will his balance show up as now.
-70 – = £90.00
10-Jun-18
Created by Mr. Lafferty Maths Dept

7. Created by Mr. Lafferty Maths Department
Integers
Now try TJ2b
Ex 1
Ch8 (page 81)
10-Jun-18
Created by Mr. Lafferty Maths Department

8. Created by Mr.Lafferty Math Dept
Starter Questions
Solve y + 75 = 100
3. Show an example of an obtuse angle.
10-Jun-18
Created by Mr.Lafferty Math Dept

9. Created by Mr. Lafferty Maths Dept
Integers
Addition & Subtraction
Learning Intention
Success Criteria
1 We are learning how to write down mathematically addition and subtraction of integers.
To be able to write down mathematically the addition and subtraction of integers.
10-Jun-18
Created by Mr. Lafferty Maths Dept

10. 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 6
= 16 4 2
(b) 8oC down from 10 o C
= 2 -2
Down - -4
(c) 3oC up from -2 o C -6 -8
= 1
-24
-22
-20
-14
-18
-16
-12
-10
(d) 6oC down from 2 o C
2 - 6 = -4
10-Jun-18
Created by Mr. Lafferty Maths Dept

11. Integers Put these temperatures in order starting with coldest first.
17oC
-3oC
-15oC
0oC
2oC
10-Jun-18
Created by Mr. Lafferty Maths Dept

12. Integers On a cold winters night the temperature drops
by 3oC every hour.
The temperature is 1oC at 10pm.
What is the temperature at 11pm.
What is the temperature at 2pm.
-2oC
-11oC
10-Jun-18
Created by Mr. Lafferty Maths Dept

13. Created by Mr. Lafferty Maths Department
Integers
Now try TJ2b
Ex 2
Ch8 (page 83)
10-Jun-18
Created by Mr. Lafferty Maths Department

14. 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.
10-Jun-18
Created by Mr. Lafferty Maths Dept

15. Created by Mr. Lafferty Maths Dept.
Integers
Addition & Subtraction
Learning Intention
Success Criteria
1. We are learning the ‘double negative’ rule for integers.
To understand the ‘double negative’ rule for integers.
2. To be able to solve problems using the ‘double negative’ rule.
10-Jun-18
Created by Mr. Lafferty Maths Dept.

16. Negative Numbers www.mathsrevision.com Rule (a) 12 + 4 = 16
Adding a negative is
the same as subtracting
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
10-Jun-18
Created by Mr. Lafferty Maths Dept

17. Created by Mr. Lafferty Maths Dept
Integers
Examples
(1)
= -4
(2) 4 + (-9)
= -5
(3)
= -15
(4) (-12)
= -14
Remember Rule !
(5)
= -30
(6) (-8) + (-9)
= -17
10-Jun-18
Created by Mr. Lafferty Maths Dept

18. Created by Mr. Lafferty Maths Dept
Integers
Examples
(1) (-3) – 4 + 2
= -5
(2) (-9) + (-2)
= -2
(3) -7 – 8 + (-3) + (-10)
= -28
(4) – 6 + (-7)
= -7
(5) -5 – (25 – 10)
= -20
(6) (-800) + (-900) + 400
= -1300
10-Jun-18
Created by Mr. Lafferty Maths Dept

19. Integers Now try TJ2b Ex 3 Ch8 (page 84) www.mathsrevision.com
Have you updated your Learning Log ?
Integers
Now try TJ2b
Ex 3
Ch8 (page 84)
Are you on Target ?
I can ?
Are you on Target ?
I can ?
10-Jun-18
Created by Mr. Lafferty Maths Department