Question

Which is a prime number?
A.0
B.1
C.3
D.9​

Answer 1

3

Explanation:

Note

Prime numbers are numbers that have two factors thus 1 and the number itself . Example; 2 ,3,5 ,7 and 11

Besides

Also 0 and 1 is not a prime number

Answer 2

C.
`\displaystyle 3`

Explanation:

Prime Numbers consist of two factours -- 1 and that number. Just so you know, you can AUTOMATICALLY eliminate the first two choises because those two numbers are not composite nor prime. Now, I can predict that your next lesson will probably be about prime factorisation, in which you have to find the prime factorisation of numbers, using two methods:

• Factour Tree
• Ladder Diagram

Factour Tree Ladder Diagram

3 3|3

| ⁻⁻

3 1

Factour Tree Ladder Diagram

9 3|9

/\ ⁻⁻

3 3 3|3

⁻⁻

1

So, the prime factorisation of 9 is
`\displaystyle 3^2,`and the prime factorisation of 3 is 3.

I am joyous to assist you at any time.