1.	How many significant digits are in the number 0.000005721?
		A.	two	B.	six
		C.	nine	D.	four
		Hint
	2.	How many significant digits are in the number 0.000723?
		A.	3	B.	7
		C.	6	D.	4
		Hint
	3.	How many significant digits area in the number 0.009?
		A.	2	B.	3
		C.	1	D.	4
		Hint
	4.	Find the sum of 5.5 meters, 5.27 meters, 6.4 meters, and 4.325 meters using the correct precision.
		A.	21.495 meters	B.	21.5 meters
		C.	21.50 meters	D.	21 meters
		Hint
	5.	Find the sum of 23.6 liters, 4.75 liters, 12.065 liters, and 9.11 liters using the correct precision.
		A.	49.53 liters	B.	49.5 liters
		C.	49.525 liters	D.	50 liters
		Hint