1.	How many significant digits area in the number 0.009?
		A.	2	B.	3
		C.	4	D.	1
		Hint
	2.	Identify the precision unit of the ruler.
		A.	1 inch	B.	inch
		C.	inch	D.	inch
		Hint
	3.	Identify the precision unit of the watch.
		A.	1 minute	B.	1 hour
		C.	1 second	D.	30 seconds
		Hint
	4.	Identify the precision unit of the scale.
		A.	1 pound	B.	5 pounds
		C.	12 pound	D.	10 pounds
		Hint
	5.	Use the correct number of significant digits to find the area of the rectangle.
		A.	140 square centimeters	B.	135.4 square centimeters
		C.	135.42 square centimeters	D.	135 square centimeters
		Hint