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# Negative Numbers - PowerPoint PPT Presentation

Negative Numbers. -5. -4. -3. -2. -1. 0. 1. 2. 3. 4. 5. counting negatively. counting positively. Any number above zero is a positive number. Positive numbers are written with no sign or a + sign in front of them and they are counted from zero to the right. -5. -4. -3. -2.

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## PowerPoint Slideshow about ' Negative Numbers' - kylene

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Presentation Transcript

-5

-4

-3

-2

-1

0

1

2

3

4

5

counting negatively

counting positively

Any number above zero is a positive number. Positive

numbers are written with no sign or a + sign in front of them

and they are counted from zero to the right.

-4

-3

-2

-1

0

1

2

3

4

5

counting negatively

counting positively

Any number below zero is a negative number. Negative

and they are counted from zero to the left.

Always look at the sign in front of a number to see if it is positive or negative.

-4

-3

-2

-1

0

1

2

3

4

5

counting negatively

counting positively

Remember:

Positive numbers get bigger the further we move right, so 5

is bigger than 2.

Negative numbers get smaller the further we move left, so -5

is smaller than -2.

-4

-3

-2

-1

0

1

2

3

4

5

counting negatively

counting positively

Example:

Which word, “bigger” or “smaller”, would fit correctly

In each of these gaps?

smaller

-7 is ___________than -1

+62 is ___________than -71

-136 is ___________than -36

bigger

smaller

As you extend a number line showing negative numbers,they

seem to get “bigger.”

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

1

2

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

1

2

The numbers seem to increase in value as they go down

the number line.

But as the negative number gets bigger, the value gets

lower. -10 is a larger number than -5, so it is further below

zero. If you look at the number line you can see that -10

is less than -5.

d

m

s

w

e

-4

-2

0

2

4

Let's Practice

-10

8

What value is letter w?

What value is letter a?

Which value is bigger -10 or 8?

Even though 10 is a bigger number than 8, 8 is bigger because 10 is negative.

Spring 7 C

o

o

Fall -4 C

Winter -12 C

If it helps you remember, think about the weather. As

temperature gets lower the negative numbers seem to

get bigger.

When the weather changes the temperature can go up or

down. If a temperature goes up, gets warmer, it is a

temperature increase. If a temperature goes down, gets

colder, it is a temperature decrease.

temperature could be 3 C. By lunchtime it is up

to 10 C.

o

o

This is a

temperature

increase of

7 C.

15

15

10

10

5

5

o

0

0

-5

-5

Example:

evening the temperature goes down to 12 C.

o

o

15

This is a

temperature

decrease of

3 C.

15

10

10

5

5

0

o

0

-5

-5

be -3 C. By lunch it is up to 6 C.

o

o

o

o

o

From -3 C to 0 C is 3 C.

15

15

10

10

This is a temperature

increase of 9 C.

5

5

o

0

0

-5

-5

o

o

o

From 0 C to 6 C is a further 6 C.

o

o

The total of 3 C + 6 C makes 9 C.

o

But what happens if we have negative temperatures?

Example:

evening the temperature goes down to -5 C.

o

o

15

o

o

o

From 3 C to 0 C is 3 C.

15

10

10

5

0

5

0

-5

This is a temperature

decrease of 8 C.

-5

o

o

o

o

The total of 3 C + 5 C makes 8 C.

o

o

o

From 0 C to -5 C is a further 5 C.

10

o

2 C

6

o

C

Let's Practice

What temperature is shown

on the thermometer?

25

o

-5 C

10

0

o

C

What temperature is shown

on the thermometer?