Unit 4 - Multipliyng and Dividing

Summary of Knowledge (what were the goals of the investigation).

The goal of this topic was to learn how to multiply and divide with negative numbers. We learned how to combine - and + ex: -7*(-8)=56. We also learned how to get the answer of operations that have multiplication and division in them. ex: -6*5/(-8)=3.75.





Key Terms.

Negative Number: A number less than 0. In a number line it is located at the left of 0.

Positive Number: A number greater than 0. in a number line it is located at the right of 0.






Task Analysis (we´ll explain how to do a problem step by step)

1.-Looking for signs - or + (for even number of negatives you get a positive and for odd number of negatives you get a negative)



2.-Then you multiply or the number example: -4*-1=5 or -5/1=-5





Examples:


1.) 7*(-8)*(-3)=168

2.) 1/2*(-2/3)*3=240

3.) (1/2)*(-2/3)*3=-1

Quiz:

Video:

Useful Pages:

http://www.coolmath-games.com/numbermonster/mult25.htm

These is a incredible math game. First of all you look for a question that says what do you want to do? Then you click multiplication. after that you select the difficulty of the game. The you just have to enjoy learning...

http://www.purplemath.com/modules/negative3.htm

Here you have a breafe explaining of a little more difficult operations. It will help a lot...