1. Negative Numbers
What do you understand by
this?

2. 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
∞

3. Understanding Negative
Numbers
The number line can also continue on past 0:
These new numbers are negative numbers.

4. Negative Numbers
The temperature
scale is often seen
vertically.
As the temperature
goes below
freezing we use
negative numbers.
0
1
2
3
4
5
6
- 1
- 2
- 3
- 4
- 5
- 6
Water freezing
Getting warmer
Getting colder

5. Negative Numbers - This time the scale is horizontal
0 1 2 3 4 5 6-1-2-3-4-5-6

6. Negative Numbers
0 2 4 6 8 10 12-2-4-6-8-10-12
The scale changed, each division is worth?

7. Negative Numbers
0 5 10 15 20 25 30-5-10-15-20-25-30
The scale changed, each division is worth?

8. Negative Numbers
-4 -3 -2 -1 0 1-6-7-8-9-10-11 -5
What’s the missing number?

9. Negative Numbers
-21 -20 -19 -18 -17 -16-23-24-25-26-27-28 -22
What’s the missing number?

10. Negative Numbers
-14 -12 -10 -8 -6 -4-18-20-22-24-26-28 -16
What’s the missing number?

11. 0
5
10
15
25
20
30
35
40
-20
-15
-10
-5

12. Negative Numbers
0 5 10 15 20 25 30-5-10-15-20-25-30
Which is colder -5 or -20? Why?

13. Can you order this set of numbers starting with
the coldest?
20
5
- 2
- 15 10
- 20

14. Discuss Temperature
Difference & Change
NNS Thermometer