# Pre-Algebra Chapter 5.1 (A) Properties of Real Numbers

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- Pre-Algebra Chapter 5.1 (A) Properties of Real Numbers

**Created:**2011-05-05

**Last Modified:**2011-07-16

Give an example of the Communitive Property of Addition

(a.b).c = a.(b.c)

5*(4x) = (5*4)x

= 20x

(6x) . 2 = 2* (6x)

= (2*6)x

= 12x

(5y)(3y) = 5*y*3*y

= 5*3*y*y

= (5*3)(y*y)

15y(second power)

-5(7b) = (-5*7)b

=-35b

(-4r)(-9t) = [(-4)(-9)](r*t)

= 36rt

(-8)(-z) =(-8)(-1z)

=[(-8)(-1)]z

=8z

-5y + 5y + 7= 0+7

=7

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