Question

Here are some numbers:

15
16
17
18
19
From the list, write down all of the prime numbers.

Answer 1

17, 19

Explanation:

Prime numbers' only factors are 1 and itself

Answer 2

17 & 19

Explanation:

you can multipy 3x5 to get 15 so thats not it

you can multiply 8x2 to get 16 so its not prime

you can multiply 9x2 and 6x3 so thats not it either

1 is the only thing that can go into 17 besides itself and 1 is the only thing that can go into 19 besides itself