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A' Directed Numbers'

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Fido is going to demonstrate working with directed numbers. Instructions: ... When the signs were the same, Fido moved. forward. Bark, bark. Worth remembering ... – PowerPoint PPT presentation

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Title: A' Directed Numbers'


1
A. Directed Numbers.
A directed number is any number,
with a
or a - in front of it.
A number by itself is assumed positive.
2
-
2

( )

But it could have a sign in front
even with brackets.
The sign may be raised to the top left corner.
2
A. Directed Numbers.
Natural numbers (counting numbers) are always
positive, Integers can be positive, negative, or
0.
-
-
2
-
2
( )
A negative number MUST have a - sign
With or without the brackets.
Or a - sign in the top left hand corner.
3
The number line.
  • Integers can be shown along a single number line.

8
-8
5
0
1
2
3
6
-1
-2
-3
-4
-5
-6
4
8 Infinity, a very big number!
If we start at 0, positive numbers increase to
the right.
Negative numbers decrease to the left of 0..
4
Working with directed numbers.
  • Calculate 4 2

8
-8
5
0
1
2
3
6
-1
-2
-3
-4
-5
-6
4
Fido is going to demonstrate working with
directed numbers. Instructions Large
move forward Raised okay
- move backward - do the
opposite
5
Working with directed numbers.
Bark, bark!
  • Calculate 4 2

8
-8
5
0
1
2
3
6
-1
-2
-3
-4
-5
-6
4
4 2
6
Start a 4
Move forward, okay, 2 places
6
Working with directed numbers.
Bark, bark!
  • Calculate -3 - -6

8
-8
5
0
1
2
3
6
-1
-2
-3
-4
-5
-6
4
So Fido moves forwards!
-3 - - 6
3
Start a -3
Move backward, do opposite, 6 places
7
  • When the signs were the same, Fido moved
  • forward.

Add

Bark, bark
- -
Worth remembering
8
Working with directed numbers.
Bark, bark!
  • Calculate 5 -2

8
-8
5
0
1
2
3
6
-1
-2
-3
-4
-5
-6
4
So Fido moves backwards!
5 - 2
3
Start a 5
Move forward, do opposite, 2 places
9
Working with directed numbers.
Bark, bark!
  • Calculate 3 - 2

8
-8
5
0
1
2
3
6
-1
-2
-3
-4
-5
-6
4
So Fido moves backwards!
3 - 2
1
Start a 3
Move backward, okay, 2 places
10
  • When the signs were different, Fido moved
  • backward.

Subtract
-
-
Bark, bark
Worth remembering
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