Answer:
Option A - 27,465 +52,534 = 79,899
Step-by-step 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.
