Directed Numbers
Positive Numbers | Negative Numbers |
‘Increase’
‘Going up’ ‘Above’ |
‘Decrease’
‘Going down’ ‘Below’ |
Example
1. Suppose 5 represents 5 floors above ground level. Use a directed number to represent 10 levels below ground level.
10 levels below ground level can be represented by –10
2. Suppose +3 km represents walking 3 km due east. Use a directed number to represent walking 7 km due west.
Walking 7km due west can be represented by –7
Number Lines
Example
–4 is on the left of –2, it means –4 is smaller than –2
A prime number is a whole number with exactly two factors, namely 1 and itself.
The number 1 is not normally considered to be rime.
The prime numbers are 2, 3, 5, 7, 11, …
A factor of a number is a whole number that divides exactly into it, with no remainder.
Example: The factors of 12 are 1, 2, 3, 4, 6, and 12.
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