alleryWhich single digit of a number decides if it is divisible by 2?
AThe first digit
BThe last digit
CThe middle digit
DThe digit sum
Answer & Solution
Correct answer: B. The last digit
1. A number is divisible by 2 when its last digit is divisible by 2.
2. Example: 376 ends in 6, and 6 / 2 = 3, so 376 is divisible by 2.
3. The first or middle digits only change multiples of 10 or more, and 10 is already a multiple of 2, so they cannot decide it.
_Source: Wikipedia, Divisibility rule, section Divisibility by 2_
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