Which of these examples is an error of addition by one?

A. [tex]$13,246 + 84,631 = 97,877$[/tex]
B. [tex]$52,634 + 25,145 = 77,779$[/tex]
C. [tex]$38,273 + 51,425 = 89,798$[/tex]
D. [tex]$46,371 + 32,618 = 78,989$[/tex]



Answer :

To determine which of these examples has an addition error, we need to verify if the sum given for each option is correct. Here are the results:

1. Option A:
[tex]\[ 13,246 + 84,631 = 97,877 \][/tex]
This sum evaluates correctly, so there is no error here.

2. Option B:
[tex]\[ 52,634 + 25,145 = 77,779 \][/tex]
This sum evaluates correctly, so there is no error here.

3. Option C:
[tex]\[ 38,273 + 51,425 = 89,798 \][/tex]
This sum does not evaluate correctly. Instead of 89,798, the correct sum is 89,698. This shows a mistake where the given result is off by one.

4. Option D:
[tex]\[ 46,371 + 32,618 = 78,989 \][/tex]
This sum evaluates correctly, so there is no error here.

Thus, the option with an error of addition by one is C: [tex]\(38,273 + 51,425 = 89,798\)[/tex].