Question 3 Multiple Choice Worth 6 points) (03.08A)
Andrew is showing his work in simplifying -4.5 +4.2 + 5.6 - 7.3. Identify any errors in his work or in his reasoning.
Step
1
2
Work
Reasoning
-4.5+ 4.2 +5.6 - 7.3 Original problem
-4.5+42 +5.6+(-7.3) Additive inverse
-4.5+(-7.3) + 4.2 +5.6 Commutative property
1-4.5+(-7.3)) + (4.2 + 5.6) Associative property
-11.8 +9.8
Simplify
-21.6
Simplity
3
4
5
Step 1: He wrote -7.3 incorrectly as +(-7.3).
Step 2: He identified changing the order of the numbers as the commutative property, which is incorrect.
Step 3: He Identified changing the grouping of the numbers as the associative property, which is incorrect.
Step 5: He simplified incorrectly.
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