Question

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

A. 27,465 +52,534 = 79,899

B. 63,528 + 24,361 = 87,889

C. 51,824 + 48,165 = 99,989

D. 35,246 + 43,732 = 78,978

Answer 1

Option A - 27,465 +52,534 = 79,899

Explanation:

To find : Which of these examples is an error of addition by one?

Solution :

We add all the examples,

A) 27,465 +52,534 = 79,899

2 7 4 6 5

5 2 5 3 4

+ ---------------

7 9 9 9 9

There is an error of addition by 1 as 79999-79899=1

B) 63,528 + 24,361 = 87,889

6 3 5 2 8

2 4 3 6 1

+ ---------------

8 7 8 8 9

No error.

C) 51,824 + 48,165 = 99,989

5 1 8 2 4

4 8 1 6 5

+ ---------------

9 9 9 8 9

No error.

D) 35,246 + 43,732 = 78,978

3 5 2 4 6

4 3 7 3 2

+ ---------------

7 8 9 7 8

No error.

Answer 2

The correct answer is:

A. 27,465 +52,534 = 79,899

Explanation:

Given are the options for addition

We have to check each addition one by one

So,

A. 27,465 +52,534 = 79,899

This option is the example of error of addition by one. The answer should have been 79,999. Hence there is an error in addition ..

Hence, option a: 27,465 +52,534 = 79,899 is the correct answer ..