It is: 3 times 5 = 15
15 23
Yes.
Do a factor tree. 15 ^ 5 3 (3 & 5 are prime) 19 is a prime number. 15: 3 * 5 19: 19 ^^They have nothing in common. Therefore, the answer is 1.
285 15 x 19 (3 x 5) x 19 The factor tree has reduced 285 to its prime factors: 3, 5, and 19.
15 is not a prime number, so it can't be a prime factor.
15 3,5 Not much of a tree. More like a factor shrub.
15 is a factor of 45, but it is not a prime number.
Five is prime and a factor of both numbers.
15 3,5
No, 1 is not a prime number.
15 3, 5
15 3,5