1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	two	B.	one
		C.	four	D.	three
		Hint
	2.	How many significant digits area in the number 0.009?
		A.	2	B.	4
		C.	3	D.	1
		Hint
	3.	Identify the precision unit of the ruler.
		A.	1 inch	B.	inch
		C.	inch	D.	inch
		Hint
	4.	Identify the precision unit of the watch.
		A.	1 minute	B.	30 seconds
		C.	1 second	D.	1 hour
		Hint
	5.	Use the correct number of significant digits to find the area of the rectangle.
		A.	135.4 square centimeters	B.	135.42 square centimeters
		C.	140 square centimeters	D.	135 square centimeters
		Hint