Maureen Curran and Mary Lou Aalbers

Hazelwood School District

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Tips

Perimeter

Area

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•You will need to click the mouse to show the answers foractivities. This will allow you to control the timing of answersshown.

•We suggest that students keep a journal

•It is critical for students to use writing skills to explain theiranswers

•Please take time to discuss possible solutions to problems.

The following lesson is addressing these standards:

•Extend student understanding of the process and structure for measurement. (MO 1.4, 2.6, 2.7)

•Apply the concepts of perimeter and area (MO 2.5, 3.8, 4.1)

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slide

Farmer Jones bought Farmer Jones bought three horsesthree horses..

He must fence in his barnyard to keep his horses from straying.

He has 72 feet of fencing available and wants to get the

largest corral for his horses.

Here are the designs he came up with.

24

12

24

12

27

27

99

20

20

20

20

18

18

18

18

He wants the largest space for his horses to run and has only 72 feet of fencing.

27

27

99

Would this work?

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27

27

99

YES!

27+9+27+9=72 feet

18

18

18

18

Click for answer

Would this work?

18

18

18

18

YES!

18+18+18+18=72 feet

20

20

20

20

Would this work?

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20

20

20

20

NO! 20+20+20+20=80 feet

Not enough fencing

24

12

24

12

Would this work?

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24

12

24

12

YES! 24+12+24+12=72

feet

27

27

99

18

18

18

1824

12

24

12

18

18

18

18

In your journal explain why Design B is the best

choice.

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