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-3. -11. Negative Numbers. Differences using positive and negative numbers. -6. Chris Clements. &lt;date&gt;. Learning Objective:. LO: I can find the difference between positive and negative integers. . Negative numbers .

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-3

-11

Negative Numbers

Differences using positive and negative numbers

-6

Chris Clements

<date>

Learning Objective:

LO: I can find the difference between positive and negative integers.

Negative numbers

Negative numbers are the result of a bigger number being subtracted from a smaller number.

5

-

8

=

-3

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

7

8

9

10

Negative numbers

Negative numbers are often used when calculating temperatures.

When using degrees centigrade (ºC) a temperature below freezing is shown by a negative number.

The thermometer is showing that the temperature is - 6ºC.

10

ºC

The higher the positive number the warmer the temperature.

5

0

The lower the negative number the colder the temperature.

REMEMBER: -1 is the highest whole negative number.

-5

-10

Negative numbers

What is the difference between the following numbers?

4

-3

-5

-4

-3

-2

-1

0

1

2

3

4

5

The answer is 7

An efficient method for doing this calculation is to add together the positive number to the negative number;

So 4 + 3 = 7 the difference is 7.

Negative numbers

Using the method shown can you find the difference between the following numbers?

11

14

9

-2

6

-8

13

27

12

-1

18

-9

31

44

24

-7

32

-12

Negative numbers

What is the difference between the two temperatures?

10

10

ºC

ºC

5

5

-6ºC

9ºC

0

0

-5

-5

The difference is 15ºC

-10

-10

Negative numbers

What is the difference between the two temperatures?

10

10

ºC

ºC

5

5

-9ºC

12ºC

0

0

-5

-5

The difference is 21ºC

-10

-10

Negative numbers

What is the difference between the two temperatures?

Spain

Sweden

35ºC

23ºC

-12ºC

Mexico

Iceland

66ºC

39ºC

-27ºC

Negative numbers

What is the difference between the two temperatures?

When finding the difference between two negative temperatures simply take away the lowest temperature from the highest temperature.

UK

Norway

-3ºC

-8ºC

5ºC

Canada

Iceland

-15ºC

-27ºC

12ºC

-11ºC

7ºC

-8ºC

-7ºC

Steps to success

1) Difference between a negative number and a positive number (add numbers together)

Difference is 8 + 7 = 15ºC

2) Difference between two negative numbers; lower negative number subtract the higher negative number.

Difference is 11 - 7 = 4ºC

<type here>

Activity

-4ºC

4ºC

Plenary

Which two numbers have a difference of 2?

-1

-0.5

0

0.5

1

1.5

How much colder is it in Birmingham than Paris?

Birmingham

10

10

ºC

ºC

The following day the temperature in Paris is 4ºC. Birmingham is 8ºC colder. What is the temperature in Birmingham?

5

5

0

0

-5

-5

-10

-10

Paris