Asked by alicia
31. Determine whether each of the following numbers is prime or composite.
(a) 231 (b) 393
(a) 231 (b) 393
Answers
Answered by
MathMate
Try the divisibility rules:
A number is divisible by 2 if the last digit is even.
(a) ..1 NO
(b) ..3 NO
A number is divisible by 3 if the sum of the digits is divisible by three.
(a) 2+3+1=6/3=2 with no remainder
(b) 3+9+3=12/3=4 with no remainder
Can you make the conclusions?
A number is divisible by 2 if the last digit is even.
(a) ..1 NO
(b) ..3 NO
A number is divisible by 3 if the sum of the digits is divisible by three.
(a) 2+3+1=6/3=2 with no remainder
(b) 3+9+3=12/3=4 with no remainder
Can you make the conclusions?
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