1.	Which of the following numbers is prime?
		A.	1	B.	15
		C.	9	D.	5
		Hint
	2.	Write the prime factorization of 204.
		A.	6 × 17	B.	2 × 17
		C.	2 × 2 × 3 × 17	D.	2 × 3 × 17
		Hint
	3.	Which of the following numbers is prime?
		A.	63	B.	57
		C.	43	D.	75
		Hint
	4.	Write the prime factorization of 810.
		A.	32 × 4 × 5	B.	2 × 5 × 92
		C.	2 ×3 × 5	D.	2 × 34 × 5
		Hint
	5.	Factor 20ef.
		A.	22 · e · f	B.	2 · 10 · e · f
		C.	4 · 5 · e · f	D.	2 · 2 · 5 · e · f
		Hint