chris clements negative numbers differences using positive and negative numbers -6 -3 -11
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Chris Clements
Negative Numbers
Differences using positive and negative numbers
-6
-3
-11
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Learning Objective:
LO: I can find the difference between positive and negative integers.
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Negative numbers Negative numbers are the result of a bigger
number being subtracted from a smaller number.
-38 =5 -
109876543210-1-2-3-4-5
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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.
-10
-5
0
5
10
ºC
The thermometer is showing that the temperature is -
6ºC.The higher the positive number the warmer the
temperature.The lower the negative number the colder the
temperature.REMEMBER: -1 is the highest
whole negative number.
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Negative numbers What is the difference between the following
numbers?
-34543210-1-2-3-4-5
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.
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Negative numbers Using the method shown can you find the
difference between the following numbers?
-29 -86
-112
-724
-918
-1232
11 14
13 27
31 44
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Negative numbers What is the difference between the two
temperatures?
-10
-5
0
5
10ºC
-10
-5
0
5
10ºC
-6ºC 9ºC
The difference is 15ºC
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Negative numbers What is the difference between the two
temperatures?
-10
-5
0
5
10ºC
-10
-5
0
5
10ºC
-9ºC 12ºC
The difference is 21ºC
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Negative numbers What is the difference between the two
temperatures?
-12ºC23ºC
Spain Sweden
35ºC
-27ºC39ºC
Mexico Iceland
66ºC
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Negative numbers What is the difference between the two
temperatures?
-8ºC-3ºC
UK Norway
5ºC
-27ºC-15ºC
Canada Iceland
12ºC
When finding the difference between two
negative temperatures simply take
away the lowest temperature
from the highest
temperature.
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1) Difference between a negative number and a positive number (add numbers together)
Steps to success
Difference is 8 + 7 = 15ºC
2) Difference between two negative numbers; lower negative number subtract the higher negative number.
7ºC-8ºC
-11ºC-7ºC Difference is 11 - 7 = 4ºC
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Plenary
How much colder is it in Birmingham than Paris?
0 1-1 -0.5 0.5
Which two numbers have a difference of 2?
1.5
-10
-5
0
5
10ºC
-10
-5
0
5
10ºC
Birmingham
Paris
The following day the temperature in Paris is 4ºC. Birmingham is 8ºC colder. What is the temperature in Birmingham?
4ºC
-4ºC