Tuesday, October 30, 2012

Pre-Algebra Lesson 10/31

Today we talked about the Distributive Property. Do you need a little more explanation?

Well, Here's a quick review!
The Distributive Property is a property of numbers that ties the operation of addition (or subtraction) and multiplication together.

It says that for ANY numbers a, b and c, a%2A%28b%2Bc%29+=+a%2Ab%2Ba%2Ac. For those used to multiplications without the multiplication sign, a%28b%2Bc%29+=+ab%2Bac.
The same property applies when there is subtraction instead of addition: a*(b-c) = a*b - a*c.

How it is used: The distributive property is used when something in parentheses ( ) is multiplied by something, or, in reverse, when you need to take some common multiplier OUT of the parentheses.
Taking x INTO parentheses:
Taking a OUT of parentheses: %0D%0Acartoon%28+%0D%0A++ax%2Bay%2C%0D%0A++a%28x%2By%29%0D%0A%29+.

You've read it, now how about some Khan Academy help!?!

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