1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	one	B.	two
		C.	four	D.	three
		Hint
	2.	How many significant digits are in the number 0.000005721?
		A.	two	B.	nine
		C.	four	D.	six
		Hint
	3.	Identify the precision unit of the watch.
		A.	1 minute	B.	30 seconds
		C.	1 second	D.	1 hour
		Hint
	4.	Use the correct number of significant digits to find the area of the rectangle.
		A.	135.42 square centimeters	B.	140 square centimeters
		C.	135.4 square centimeters	D.	135 square centimeters
		Hint
	5.	Use the correct number of significant digits to find the area of the parallelogram.
		A.	41.225 square meters	B.	41 square meters
		C.	41.23 square meters	D.	41.2 square meters
		Hint