1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	four	B.	three
		C.	two	D.	one
		Hint
	2.	How many significant digits area in the number 0.009?
		A.	1	B.	3
		C.	2	D.	4
		Hint
	3.	Identify the precision unit of the watch.
		A.	1 second	B.	1 minute
		C.	30 seconds	D.	1 hour
		Hint
	4.	Find the sum of 5.5 meters, 5.27 meters, 6.4 meters, and 4.325 meters using the correct precision.
		A.	21.50 meters	B.	21 meters
		C.	21.5 meters	D.	21.495 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.	49.525 liters	B.	49.5 liters
		C.	50 liters	D.	49.53 liters
		Hint