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# Today we will talk about directed number!

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## Lau Ting chi

on 11 October 2013

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#### Transcript of Today we will talk about directed number!

Negative Numbers
And we will use negative number when the number is smaller than zero.
For example:

Mickey has \$20 at first, then she borrowed \$80 from Gigi. So how much did she owned Gigi ?

The amount of money:
+20-80
= -60 (dollars)

In this case we will use negative numbers.
The signs
Now, we are going to tell you some tips! The important thing that you MUST REMEMBER are :

+ +
=

+

- +
=

-
- -

=
+

+ -
=

-
Do you realist that if we have
same signs
, you will usually have a
; if we have
different signs
, you will usually have a
? Do you agree with it?
Mathematics - Directed numbers
Conclusion
~ The End ~
design by Dóri Sirály for Prezi
Start
Positive Numbers
We will use positive number when the number is larger than zero.
For example:

Victoria has \$50 at first, then her mother give her another \$50. So how much does she has now?

The amount of money:
+50+50
= +100 (dollars)

In this case we will use positive numbers.
Janet is going to Ocean Park, a ticket for adult ticket cost \$272. Janet only has \$200 in her wallet. How much more do she need in order to have enough money to buy a ticket?