1.	How many significant digits are in the number 0.000005721?
		A.	six	B.	four
		C.	nine	D.	two
		Hint
	2.	How many significant digits area in the number 0.009?
		A.	3	B.	4
		C.	1	D.	2
		Hint
	3.	Identify the precision unit of the scale.
		A.	10 pounds	B.	1 pound
		C.	12 pound	D.	5 pounds
		Hint
	4.	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.	49.53 liters
		C.	49.5 liters	D.	50 liters
		Hint
	5.	Use the correct number of significant digits to find the area of the rectangle.
		A.	135.42 square centimeters	B.	135 square centimeters
		C.	135.4 square centimeters	D.	140 square centimeters
		Hint