1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	three	B.	two
		C.	four	D.	one
		Hint
	2.	How many significant digits are in the number 0.000723?
		A.	7	B.	3
		C.	6	D.	4
		Hint
	3.	How many significant digits area in the number 0.009?
		A.	1	B.	4
		C.	2	D.	3
		Hint
	4.	Identify the precision unit of the watch.
		A.	1 hour	B.	1 second
		C.	30 seconds	D.	1 minute
		Hint
	5.	Use the correct number of significant digits to find the area of the rectangle.
		A.	135.42 square centimeters	B.	140 square centimeters
		C.	135 square centimeters	D.	135.4 square centimeters
		Hint