1.	How many significant digits are in the number 0.000005721?
		A.	six	B.	two
		C.	four	D.	nine
		Hint
	2.	How many significant digits are in the number 0.000723?
		A.	7	B.	6
		C.	3	D.	4
		Hint
	3.	How many significant digits area in the number 0.009?
		A.	1	B.	3
		C.	2	D.	4
		Hint
	4.	Identify the precision unit of the watch.
		A.	1 hour	B.	1 second
		C.	1 minute	D.	30 seconds
		Hint
	5.	Find the sum of 5.5 meters, 5.27 meters, 6.4 meters, and 4.325 meters using the correct precision.
		A.	21.5 meters	B.	21.50 meters
		C.	21.495 meters	D.	21 meters
		Hint