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Module 1: Relationships Between Quantitates and Reasoning with Equations and Their Graphs
24 | P a g e L e s s o n 7
Lesson 7: The Commutative and Associative Properties
Home Work 1. Let !, !, !, and ! be real numbers. Fill in the missing term of the following diagram to show that (! + !) + ! + ! is
sure to equal ! + ! + (! + !).
2. The following portion of a flow diagram shows that the expression !!!! + !!!! is equivalent to the expression
!!!! + !!!!.
Fill in each circle with the appropriate symbol: Either !!+ (for the “commutative property of addition”) or !!× (for the “commutative property of multiplication”).
3. Fill in the blanks of this proof showing that (! + 5)(! + 2) is equivalent !2 + 7! + 10. Write either “commutative property,” “associative property,” “distributive property,” or “combine like terms” in each blank.
(! + 5)(! +2) = (! + 5)! + (! + 5) × 2 _________________________
= !(! + 5) + (! + 5) × 2 ___________________
= !(! + 5) + 2(! + 5) ______ = !2 + ! × 5 + 2(! + 5) _____________________________
= !2 + 5! + 2(! + 5) ______
= !2 + 5! + 2! + 10 ______
= !2 + (5! + 2!) + 10 ______
= !2 + 7! + 10 ________________________________
4. If !! = 37 and !! = , what is the value of the product ! × ! × ! × !?
Module 1: Relationships Between Quantitates and Reasoning with Equations and Their Graphs
25 | P a g e L e s s o n 7
5. Fill in each circle of the following flow diagram with one of the letters: C for commutative property (for either addition or multiplication), A for associative property (for either addition or multiplication), or D for distributive property.
6. The following is a proof of the algebraic equivalency of (2!)3 and 8!3. Fill in each of the blanks with either the statement
“commutative property” or “associative property.”
2! ! = 2! ∗ 2! ∗ 2!
= 2 ! ∗ 2 ! ∗ 2 !
= 2 2! 2! !
= 2 ∗ 2 ! ∗ 2 ! ∗ !
= 2 ∗ 2(2x)x ∗ x
= (2 ∗ 2 ∗ 2)(! ∗ ! ∗ !)
= 8!!
Module 1: Relationships Between Quantitates and Reasoning with Equations and Their Graphs
26 | P a g e L e s s o n 7