#### Solved Examples and Worksheet for Selecting Appropriate Units and Tools

Q1Which of the following units is suitable for measuring the width of a road?

A. miles
B. millimeters
C. feet
D. inches

Step: 1
The width of a road will be a very big number if it is measured in millimeters or inches.
Step: 2
The width of a road will be a small part of a mile.
Step: 3
Feet is a suitable unit to measure the width of a road.
Q2Which of the following is an appropriate unit to measure the volume of a cylinder?
A. square feet
B. ounces
C. cubic centimeters
D. meters

Step: 1
Square feet is the unit to measure area, ounces is the unit to measure mass and meters is used to measure the distance.
Step: 2
Volume of a cylinder = base area × height of the cylinder
Step: 3
So, volume of a cylinder will be in cubic units.
Step: 4
Therefore, cubic centimeters is the appropiate unit to measure the volume of a cylinder.
Correct Answer is :   cubic centimeters
Q3Identify the appropriate unit to measure the volume of an aquarium.

A. liters
B. milliliters
C. centimeters
D. grams

Step: 1
The appropriate unit to measure the volume of an aquarium is 'liters'.
Q4What would be the most reasonable unit to measure the perimeter of a hexagon?

A. cm2
B. cm3
C. ft2
D. cm

Step: 1
The perimeter of a hexagon is the sum of the lengths of all the sides of the hexagon.
Step: 2
cm2, ft2 are the units of area and cm3 is the unit of volume.
Step: 3
So, the most reasonable unit to measure the perimeter of the hexagon is cm.
Q5Identify the appropriate unit of measure for the surface area of a rectangular box.

A. meter
B. centimeter
C. square meter
D. cubic centimeter

Step: 1
The surface area of a rectangular box is the sum of the areas of all the faces of the box.
Step: 2
Area measured in square units.
Step: 3
So, the appropriate unit of measure for the surface area of a rectangular box is square meter.
Correct Answer is :   square meter
Q6Which of the following represents the volume of a rectangular prism?
A. 8xyz ft
B. 8xyz ft2
C. 8xyz ft3
D. (8 + xyz) ft

Step: 1
Volume is measured in cubic units.
Step: 2
Volume of a rectangular prism = length × width × height.
Step: 3
Among the choices, 8xyz ft3 represents the volume of a rectangular prism.
Correct Answer is :   8xyz ft3
Q7Which of the following units would you use to measure the volume of a sphere?

A. ft
B. in.
C. in.2
D. in.3

Step: 1
Volume is measured in cubic units.
Step: 2
Among the choices, in.3 can be used to measure the volume of the sphere.
Q8Identify the appropriate unit of measurement to express the volume of a cereal box.

A. m3
B. m
C. cm2
D. cm3

Step: 1
1 meter = 100 centimeters
1 meter > 1 centimeter
Step: 2
Meter 'm' is used to find the distance around the cereal box.
cm2 is used to find the area of the cereal box.
m3 is a very big unit to measure the volume of cereal box.
Step: 3
So, cm3 is the appropriate unit used to measure the volume of the cereal box.
Q9Which of the following is an appropriate unit to measure the volume of a box?
A. miles
B. ounces
C. square feet
D. cubic inches

Step: 1
Square feet is the unit to measure area, ounces is the unit to measure mass, and miles is used to measure the distance.
Step: 2
Therefore, cubic inches is the appropiate unit to measure the volume of a box.
Correct Answer is :   cubic inches
Q10Which of the unit would you use to measure the weight of an orange?

A. kilogram
B. gram
C. liter
D. pint

Step: 1
Weight is a measure of how heavy an object is.
Step: 2
Liter and pint are the units which are used to measure capacity.
Step: 3
Kilogram is used to measure the weight of heavy objects.
Step: 4
Among the choices, gram is the apropriate unit to measure the weight of an orange.