The purpose of this activity is to support students measure areas and perimeters of rectangle when the side lengths have simple fractions.
Provide the students with copies of Copymaster Five and calculators.
What do you notice about all these rectangles? (Students should see that many side lengths are decimals and fractions)
Your task is to find the area and perimeter of each rectangle.
Put the rectangles in order by area then order them by perimeter.
Are the orders the same?
Rectangle |
A |
B |
C |
D |
E |
Area |
38sq units |
35.75 sq units |
43.75sq units |
40sq units |
30sq units |
Perimeter |
27units |
26units |
27.5units |
30 2⁄3 units |
29units |
Note that the orders are different for area and perimeter.
Next steps
Extend interpretation area and perimeter with problems where area or perimeter is given but a side length is not. Two examples might be:
The perimeter is 42.2 cm. What is the width of the rectangle?
The area is 99.54cm2. What is the width of the rectangle marked ?
Printed from https://meaningfulmaths.nt.edu.au/mmws/nz/resource/working-partial-units at 11:41pm on the 26th February 2024