It is: 5 times 7 = 45
15 is a factor of 45, but it is not a prime number.
5, yes. 45, no.
Yes
Use a factor tree. 45 15,3 5,3,3
39 and 45 are not relatively prime because they have 3 as a common factor. Relatively prime numbers have no common factor greater than 1.
45 and 36 are not relatively prime because they have 3 as a common factor.
That's prime factorization. 45 15,3 5,3,3
There are two prime factors of 45, they are 3 and 5. The prime factors of 54 are 2 and 3.
45 = 3 * 3 * 5
3 x 3 x 5 = 45
45 = 32 x 51
Since the GCF of 45 and 56 is 1, they are relatively prime.