Transcript Positive and Negative Numbers

Positive and Negative Numbers
It is 2oC
4
3
2
1
0
• The temperature drops by 3
degrees
• What temperature is it now?
-1
-2
-3
o
-1 C
It is 4oC
4
3
2
1
0
• The temperature drops by 5
degrees
• What temperature is it now?
-1
-2
-3
o
-1 C
It is -2oC
4
3
2
1
0
• The temperature rises by 3
degrees
• What temperature is it now?
-1
-2
-3
o
+1 C
It is 10oC
20
15
10
5
0
-5
-10
-15
• The temperature drops by
15oC
• What is the temperature
now?
o
-5 C
20
It is 15oC
15
10
5
0
-5
• The temperature drops by
20oC
• What is the temperature
now?
-10
-15
o
-5 C
Definition
• Positive number – a number
greater than zero.
0 1 2 3 4 5 6
Definition
• Negative number – a number
less than zero.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Definition
• Opposite Numbers – numbers
that are the same distance from
zero in the opposite direction
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Definition
• Integers – Integers are all the
whole numbers and all of their
opposites on the negative
number line including zero.
7
opposite
-7
Negative Numbers Are Used to
Measure Under Sea Level
30
20
10
0
-10
-20
-30
-40
Negative Numbers Are Used to Show
Debt
Let’s say you borrowed $5 from your friend
that means you owe your friend $5. You
have -$5
Positive & Negative Numbers
Working with positive and negative
numbers is like driving in traffic.
You have to watch the traffic signs
and follow the driving rules.
Hint
• If you don’t see a negative or
positive sign in front of a
number it is positive.
+9
Word Clues
Positive
Gain
Increase
Received
Got
Greater
Negative
Below
Loss
Lost
Owe
less
You try: Write this Number
• Ten degrees below zero
• I owe you $83
• I lost 28 marbles
• I earned 3 new DS games for getting all fours on
my report card.
Compare positive and negative
numbers
-4
4
Remember Positive numbers are always bigger than
negative numbers.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Compare positive and negative
numbers
-5
-1
Remember Positive numbers are always bigger than
negative numbers.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Compare positive and negative
numbers
-9
0
Remember Positive numbers are always bigger than
negative numbers.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Compare positive and negative
numbers
-13
-26
Remember Positive numbers are always bigger than
negative numbers.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Compare positive and negative
numbers
6
-8
Remember Positive numbers are always bigger than
negative numbers.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Great Job!
•Page 19 # 10-18
•Page 21 #3-6
Wed
Tues
Fill in the number line with positive
and negative numbers
0
>, < or =
-4
4
-13
6
-8
-9
-26
0
20
15
10
5
• What temperature is 10
degrees colder than -5
0
-5
-10
-15
• What temperature is 10
warmer than -5
Order the numbers from least to
greatest
•4, -4, 2, 0, -1
•-7, 3, -5, 2, 7