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. Write feedback to Andrew explaining the mistake he made and how to correct his work.

Step

Work

Reasoning

−4.5 + 4.2 + 5.6 − 7.3 Original problem
1 −4.5 + 4.2 + 5.6 + (−7.3) Additive inverse
2 −4.5 + (−7.3) + 4.2 + 5.6 Commutative property
3 (−4.5 + (−7.3)) + (4.2 + 5.6) Associative property
4 −11.8 + 9.8 Simplify
5 −21.6 Simplify

Question

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. Write feedback to Andrew explaining the mistake he made and how to correct his work.

Step

Work 

Reasoning


 −4.5 + 4.2 + 5.6 − 7.3 Original problem 
1 −4.5 + 4.2 + 5.6 + (−7.3) Additive inverse 
2 −4.5 + (−7.3) + 4.2 + 5.6  Commutative property 
3 (−4.5 + (−7.3)) + (4.2 + 5.6) Associative property 
4 −11.8 + 9.8 Simplify 
5 −21.6 Simplify

radar · Answer

The step from 4 to 5 is improper.

rebeccaxhawaii · Answer

it was supposed to be -2 not -21.6

rebeccaxhawaii · Answer

so step four to five is not correct

rebeccaxhawaii · Answer

because you are adding positives to the negative

anonymous · Answer

Can you explain it

welshfella · Answer

yea thats right

welshfella · Answer

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