A) 0
B) 1
C) 2
D) 640
Correct Answer: C
Solution :
A number is divisible by 8 if it is divisible by both 2 and 4. 642 has 2 in the ones place. So, it is divisible by 2. For 642 to be divisible by 4, the number formed by the digits in its ones and tens place must be divisible by 4. \[\text{42 }-\text{ 2 }=\text{ 4}0\] is divisible by 4. Hence, 2 must be subtracted from 642 to make it divisible by 8.
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