1.	If the mass of a sample is determined to be 0.078 kilogram, find the number of significant digits.
		A.	two	B.	one
		C.	three	D.	four
		Hint
	2.	How many significant digits are in the number 0.000723?
		A.	4	B.	6
		C.	7	D.	3
		Hint
	3.	Identify the precision unit of the watch.
		A.	1 minute	B.	1 hour
		C.	30 seconds	D.	1 second
		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.	49.53 liters
		C.	49.5 liters	D.	49.525 liters
		Hint
	5.	Use the correct number of significant digits to find the area of the rectangle.
		A.	135.42 square centimeters	B.	135.4 square centimeters
		C.	140 square centimeters	D.	135 square centimeters
		Hint