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Positive and Negative Numbers
4
3
2
1
0
-1
-2
-3
It is 2oC
• The temperature drops by 3 degrees
• What temperature is it now?
-1oC
4
3
2
1
0
-1
-2
-3
It is 4oC
• The temperature drops by 5 degrees
• What temperature is it now?
-1oC
4
3
2
1
0
-1
-2
-3
It is -2oC
• The temperature rises by 3 degrees
• What temperature is it now?
+1oC
4
3
2
1
0
-1
-2
-3
4
3
2
1
0
-1
-2
-3
4
3
2
1
0
-1
-2
-3
It is 10oC
• The temperature drops by 15oC
• What is the temperature now?
-5oC
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
It is 15oC
• The temperature drops by 20oC
• What is the temperature now?
-5oC
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
Definition
• Positive number – a number greater than zero.
0 1 2 3 4 5 6
Definition
• Negative number – a number less than zero.
0 1 2 3 4 5 6-1-2-3-4-5-6
Definition• Opposite Numbers – numbers
that are the same distance from zero in the opposite direction
0 1 2 3 4 5 6-1-2-3-4-5-6
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
0102030
-10-20-30-40-50
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
PositiveGain IncreaseReceivedGotGreater
NegativeBelowLossLostOweless
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
0 1 2 3 4 5 6-1-2-3-4-5-6
-4 4 Remember Positive numbers are always bigger than negative numbers.
Compare positive and negative numbers
0 1 2 3 4 5 6-1-2-3-4-5-6
-5 -1 Remember Positive numbers are always bigger than negative numbers.
Compare positive and negative numbers
0 1 2 3 4 5 6-1-2-3-4-5-6
-9 0 Remember Positive numbers are always bigger than negative numbers.
Compare positive and negative numbers
0 1 2 3 4 5 6-1-2-3-4-5-6
-13 -26 Remember Positive numbers are always bigger than negative numbers.
Compare positive and negative numbers
0 1 2 3 4 5 6-1-2-3-4-5-6
6 -8 Remember Positive numbers are always bigger than negative numbers.
Great Job!
•Page 19 # 10-18 Tues
•Page 21 #3-6 Wed
Fill in the number line with positive and negative numbers
0
>, < or =
-4 4
6 -8
-13 -26
-9 0
• What temperature is 10 degrees colder than -5
• What temperature is 10 warmer than -5
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
20
15
10
5
0
-5
-10
-15
Order the numbers from least to greatest
•4, -4, 2, 0, -1
• -7, 3, -5, 2, 7
