Numeracy Worksheet - Castlebrae Community High School - 2012 Page 19
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47FHS Numeracy
Negative Numbers
contents page
We can extend our number line to include numbers below zero.
The numbers below zero are called NEGATIVE numbers.
(We NEVER use the word MINUS as this is used for subtraction).
-
+
bigger
smaller
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
The further LEFT we go
The further RIGHT we
the SMALLER we get
go the BIGGER we get
Example 1
Compare the following pairs of numbers.
Level 3
a) 3 and -4
b) -6 and 4
c) -8 and -3
<
means less than
>
3 > -4
-6 < 4
-8 < -3
means greater than
When we ADD a positive number we move RIGHT on our number line.
When we SUBTRACT a positive number we move LEFT on our number line.
Example 2
Calculate:
Level 3
7 – 9 = -2
-
+
bigger
smaller
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
START
Example 3
Calculate:
To subtract move left
Level 3
-5 + 8 = 3
-
+
bigger
smaller
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
START
To add move right
19
L Watson 2012
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