Download Understanding Negative Numbers

Negative Numbers
What do you understand by
this?
Understanding Negative Numbers
We think of numbers being on a number line:
∞
These numbers are all positive numbers,
although we don’t actually put the + sign
in front of each number
Understanding Negative
Numbers
The number line can also continue on past 0:
These new numbers are negative numbers.
6
Negative Numbers
5
4
The temperature
scale is often seen
vertically.
3
Getting warmer
2
1
0
Water freezing
-1
As the temperature
goes below
freezing we use
negative numbers.
-2
-3
-4
-5
-6
Getting colder
Negative Numbers - This time the scale is horizontal
-6 -5
-4
-3 -2
-1
0
1
2
3
4
5
6
Negative Numbers
-12 -10 -8
-6
-4
-2
0
2
4
6
The scale changed, each division is worth?
8
10 12
Negative Numbers
-30 -25 -20 -15 -10 -5
0
5
10
15 20
The scale changed, each division is worth?
25
30
Negative Numbers
-11 -10 -9
-8
-7
-6
-5
What’s the missing number?
-4
-3
-2
-1
0
1
Negative Numbers
-28 -27 -26 -25 -24 -23 -22
What’s the missing number?
-21 -20 -19 -18 -17 -16
Negative Numbers
-28 -26 -24 -22 -20 -18 -16
What’s the missing number?
-14 -12 -10 -8
-6
-4
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
Negative Numbers
Which is colder -5 or -20?
-30 -25 -20 -15 -10 -5
Why?
0
5
10
15 20
25
30
Can you order this set of numbers starting with
the coldest?
20
- 15
- 20
5
-2
10
Discuss Temperature
Difference & Change
NNS Thermometer