1.	How many significant digits are in the number 0.000005721?
		A.	six	B.	four
		C.	two	D.	nine
		Hint
	2.	Identify the precision unit of the ruler.
		A.	inch	B.	inch
		C.	1 inch	D.	inch
		Hint
	3.	Find the sum of 5.5 meters, 5.27 meters, 6.4 meters, and 4.325 meters using the correct precision.
		A.	21.50 meters	B.	21.495 meters
		C.	21 meters	D.	21.5 meters
		Hint
	4.	Find the sum of 23.6 liters, 4.75 liters, 12.065 liters, and 9.11 liters using the correct precision.
		A.	50 liters	B.	49.525 liters
		C.	49.5 liters	D.	49.53 liters
		Hint
	5.	Use the correct number of significant digits to find the area of the rectangle.
		A.	140 square centimeters	B.	135.42 square centimeters
		C.	135 square centimeters	D.	135.4 square centimeters
		Hint