SOLUTION: Which number could be the ones digit of a three-digit prime number? A) 0 B) 4 C) 5 D) 7

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Question 400868: Which number could be the ones digit of a three-digit prime number? A) 0 B) 4 C) 5 D) 7
Found 2 solutions by josmiceli, richard1234:
Answer by josmiceli(19441) About Me  (Show Source):
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If the units digit is 0, the
number is divisible by 10 ,and not prime
If the units digit is 4,
it is divisible by 2
If the units digit is 5, it
is divisible by 5
If the units digit is 7, the
number could be prime.
37 is a prime number
77 1s not prime

Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
7. 0 and 4 are both odd, so any three-digit number ending in 0 or 4 is divisible by 2. Also, 5 is prime, but any larger number ending in 5 is divisible by 5, so 7 is the only possibility.