Which is the prime factorization of forty-five?
Choose one answer.
a. one times forty-five
b. five times nine
c. three times fifteen
d. three times three times five

Question

Which is the prime factorization of forty-five?
Choose one answer.
	 a. one times forty-five	
	 b. five times nine	
	 c. three times fifteen	
	 d. three times three times five

whpalmer4 · Answer

Hint: here are the first half-dozen prime numbers:

2,3,5,7,11,13

anonymous · Answer

C???????

whpalmer4 · Answer

45 is not divisible by 2
45 is divisible by 3.  After dividing it by 3, what do you have?  Is that divisible by 3?  How about by 5?  7?  11?  13?

kirbykirby · Answer

realize that prime numbers can only be divided by 1 or itself. 
So check: is 9 prime? is 15 prime?  is 45 prime? (i.e. can you decompose it into a product of integer numbers)

whpalmer4 · Answer

Any number that ends in 5 or 0 is divisible by 5.

anonymous · Answer

So not c. But i am going to say either B or D

anonymous · Answer

I am not really sure I:

kirbykirby · Answer

Check: is 9 prime? That is, can you divide 9 by some other number (other than 9 or 1)? If so, then 9 is not prime!