1.	Which of the following numbers is prime?
		A.	15	B.	1
		C.	5	D.	9
		Hint
	2.	Which of the following numbers is composite?
		A.	31	B.	9
		C.	23	D.	1
		Hint
	3.	What are the prime factors of 810?
		A.	3, 5	B.	3, 4, 5
		C.	2, 3, 5	D.	2, 5, 9
		Hint
	4.	Write the prime factorization of 810.
		A.	2 × 5 × 92	B.	2 ×3 × 5
		C.	32 × 4 × 5	D.	2 × 34 × 5
		Hint
	5.	Factor 18ab2.
		A.	2 · 3 · 3 · a · b · b	B.	2 · 3 · a · b · b
		C.	2 · 3 · 3 · a · b	D.	22 · 3 · a · b · b
		Hint