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1.8 Properties of Real Numbers

Commutative (Addition) The “you can switch it around and it just don’t matter” property a + b = b + a

Commutative (Multiplication) The “you can switch it around and it just don’t matter” property a  b = b  a

Associative (Addition) Order of numbers stay, parenthesis shift (a + b) + c = a + (b + c)

Associative (Multiplication) Order of numbers stay, parenthesis shift (a  b)  c = a  (b  c)

Identity Property (Addition) The “zero” property What can you add to a number to get the SAME EXACT NUMBER? a + 0 = a

Identity Property (Multiplication) The “one” property What can you multiply a number by to get the SAME EXACT NUMBER? a  1 = a

Inverse (Addition) For every value a, there is an equal but opposite a (additive inverse) a + (-a) = 0

Inverse (Multiplication) For every value a, there is an equal but reciprocal of a (multiplicative inverse) a  ( ) = 0

BOOKS! PAGE 55 CHECK UNDERSTANDING (MIDDLE OF PAGE) A - F

Homework Page 57 #32 – 43 ALL #45, 46

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