Question

6. If a number is divisible by 3, need it be tested for 9? Justify your answer by stating any two nu
which are divisible by 3 but not by 9?
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Answer 1

Answer:No.. if a number is divisible by 3 then it need not be divisible by 9 because only every third multiple of 3 is a multiple of 9 but the two multiples in the middle are not. Eg. 12 which is divisible by 3 but not 9 and also 33 which is divisible by 3 and not 9

Step-by-step explanation:

Every number divisible by 9 is divisible by 3. For example, 7425 is divisible by 9, hence it is divisible by 3. However, a number divisible by 3 is not necessarily divisible by 9. For example 6, 12, 15, 21, 24, 30 are all divisible by 3 but none of them is divisible by 9.

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