1.	Use the factor tree to write the prime factorization of 120.
		A.	2 × 60	B.	2 × 2 × 3 × 5
		C.	2 × 3 × 5	D.	2 × 2 × 2 × 3 × 5
		Hint
	2.	What are the prime factors of 120?
		A.	2, 2, 30	B.	2, 3, 5
		C.	2, 2, 2, 3, 5	D.	2, 60
		Hint
	3.	Which of the following numbers is composite?
		A.	1	B.	23
		C.	31	D.	9
		Hint
	4.	What are the prime factors of 400?
		A.	2, 200	B.	2, 4, 5
		C.	2, 5	D.	4, 10, 10
		Hint
	5.	What are the prime factors of 810?
		A.	2, 3, 5	B.	2, 5, 9
		C.	3, 5	D.	3, 4, 5
		Hint