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Properties and Mental Computation p. 80

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Math talk What are some math properties that we use? Why do you think we have them? Do you ever use them?

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Commutative Property Commutative Property of addition Commutative Property of addition a+b = b+a a+b = b+a Commutative Property of multiplication Commutative Property of multiplication a x b = b x a a x b = b x a

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Distributive Property This property has multiplication and either addition or subtraction This property has multiplication and either addition or subtraction a(b + c) = ab + ac a(b + c) = ab + ac a(b – c) = ab - ac a(b – c) = ab - ac

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Associative Property Associative property of addition Associative property of addition (a+b)+c = a+(b+c) (a+b)+c = a+(b+c) Associative property of multiplication Associative property of multiplication (a x b) x c = a x (b x c) (a x b) x c = a x (b x c)

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Please look at p. 84 Properties of equality Properties of equality Reflexive property a=a Reflexive property a=a Symmetric property a=b b=a Symmetric property a=b b=a Transitive property Transitive property a=b and b=c, then a=c a=b and b=c, then a=c

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Please look at p. 86 #5 #6

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