Determine a missing dimension given the area and one dimension
Objectives
Student will be able to:
draw a diagram for a given situation.
calculate a missing dimension given the area and one dimension of a rectangle.
Exercises
Complete the exercises. Draw a diagram and then solve. Show all work.
1.
Explain how to find the length of a rectangle if you are given the total area and the width.
Divide the area by the width to find the length.
1
.
Correct
Incorrect
Not Assigned
2.
Marsha buys a rectangular tablecloth. The package tells her the total area of the tablecloth is 35 square feet. She measures the length of the tablecloth to be 7 feet. How wide is the tablecloth?
The tablecloth is 5 feet wide.
Check student's diagram.
Check student's work.
2
.
Correct
Incorrect
Not Assigned
3.
A concrete company is installing a rectangular driveway that is supposed to have a total area of 336 square yards. The length of the driveway is 48 yards. How wide should the concrete company make the driveway so that it has a total area of 336 square yards?
The driveway should be 7 yards wide.
Check student's diagram.
Check student's work.
3
.
Correct
Incorrect
Not Assigned
4.
Mr. Wilson bought grass seed to cover a rectangular portion of his yard. The directions say the grass seed will cover a total area of 300 square feet. If Mr. Wilson's yard is 25 feet wide, what length of his yard can he cover with grass seed if he uses all the grass seed according to the directions?
Mr. Wilson can cover a length of 12 feet with grass seed.
Check student's diagram.
Check student's work.
4
.
Correct
Incorrect
Not Assigned
5.
A rectangular poster has an area of 280 square inches. The length of the poster is 20 inches. What is the width of the poster?
The poster has a width of 14 inches.
Check student's diagram.
Check student's work.
5
.
Correct
Incorrect
Not Assigned
6.
Rachael wants to plant a garden that is 80 square feet. Give three different dimensions she could use for her garden.
Answers will vary. Some possible answers are:
8ft by 10 ft; 4 ft by 20 ft; 2 ft by 40 ft.
6
.
Correct
Incorrect
Not Assigned