Lesson Page

Math A

Properties of Real Numbers 


Let a, b, and c be real numbers, variables, or algebraic expressions.

 

Property

Example

 1.  Commutative Property of Addition 
a + b = b + a
2 + 3 = 3 + 2

2.

Commutative Property of Multiplication 
a • b = b • a
2 • ( 3 ) = 3 • ( 2 )
3. Associative Property of Addition 
a + ( b + c ) = ( a + b ) + c 
2 + ( 3 + 4 ) = ( 2 + 3 ) + 4
4.  Associative Property of Multiplication 
a • ( b • c ) = ( a • b ) • c
2 • ( 3 • 4 ) = ( 2 • 3 ) • 4
5. Distributive Property 
a • ( b + c ) = a • b + a • c
2 • ( 3 + 4 ) = 2 •  3 + 2 • 4
6. Additive Identity Property
a + 0 = a
 3 + 0 = 3
7.  Multiplicative Identity Property 
a •  1 = a
3 • 1  = 3
8. Additive Inverse Property 
a + ( -a ) = 0
3 + (-3) = 0
9.  Multiplicative Inverse Property 

Note: a can not = 0

 


Caldwell