High School

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Roberto delivers 252 newspapers each morning. This morning, he has already delivered 197. He subtracts to find that he has 55 left to deliver today.

[tex]
\[
\begin{array}{r}
252 \\
-197 \\
\hline
55 \\
\end{array}
\]
[/tex]

Which equations can he use to verify his calculation? Check all that apply.

A. [tex]197 + 55 = 252[/tex]

B. [tex]197 - 55 = 142[/tex]

C. [tex]252 - 55 = 197[/tex]

D. [tex]252 + 197 = 449[/tex]

E. [tex]55 + 55 = 110[/tex]

Answer :

Roberto delivers a total of [tex]$252$[/tex] newspapers and has already delivered [tex]$197$[/tex], so he has
[tex]$$252 - 197 = 55$$[/tex]
newspapers left. We can check his calculation with the following equations:

1. First, if we add the newspapers already delivered and the ones left, we should get the total:
[tex]$$197 + 55 = 252$$[/tex]
This correctly confirms the calculation.

2. Another way is to subtract the remaining newspapers from the total to see if we recover the number already delivered:
[tex]$$252 - 55 = 197$$[/tex]
This also confirms his subtraction is correct.

Thus, the equations that verify his calculation are
[tex]$$197+55=252$$[/tex]
and
[tex]$$252-55=197.$$[/tex]

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