1.	Use the factor tree to write the prime factorization of 120.
		A.	2 × 3 × 5	B.	2 × 60
		C.	2 × 2 × 2 × 3 × 5	D.	2 × 2 × 3 × 5
		Hint
	2.	Which of the following numbers is prime?
		A.	1	B.	9
		C.	5	D.	15
		Hint
	3.	Which of the following numbers is composite?
		A.	31	B.	23
		C.	9	D.	1
		Hint
	4.	Write the prime factorization of 1500.
		A.	22 × 3 × 52 × 102	B.	22 × 3 × 53
		C.	2 × 3 × 5	D.	22 × 3 × 52
		Hint
	5.	What are the prime factors of 810?
		A.	3, 5	B.	3, 4, 5
		C.	2, 5, 9	D.	2, 3, 5
		Hint