1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	one	B.	four
		C.	two	D.	three
		Hint
	2.	How many significant digits are in the number 0.000005721?
		A.	two	B.	six
		C.	four	D.	nine
		Hint
	3.	How many significant digits area in the number 0.009?
		A.	4	B.	1
		C.	3	D.	2
		Hint
	4.	Identify the precision unit of the watch.
		A.	1 second	B.	30 seconds
		C.	1 hour	D.	1 minute
		Hint
	5.	Find the sum of 23.6 liters, 4.75 liters, 12.065 liters, and 9.11 liters using the correct precision.
		A.	49.525 liters	B.	49.53 liters
		C.	49.5 liters	D.	50 liters
		Hint