Post by Shontall Billinghurst on Jun 4, 2009 15:54:53 GMT -5
Subject: Mathematics
Topic: Measuring
Sub topic: Perimeter
Grade: Three
Age: 7-9 years
Number of Students: 24
Number of Males: 11
Number of Females: 13
Time: 45 minutes
Objectives: At the end of this lesson students should be able to:
• Recall the basic principles of measuring.
• Apply rules or methods to assist in finding distances around various objects.
• Define the term ‘perimeter.’
• Select the most appropriate measuring tool for finding perimeters.
Instructional Materials:
12 metre sticks
2 balls of string
Flat cut-out shapes (various)
Jug of water
Empty cardboard box
Previous Knowledge:
• Students have demonstrated an understanding of how to measure using standard forms.
• Students possess the ability to guess (estimate) the length of various items.
• Students also demonstrate the knowledge of various units of measurements, such as inches, centimeters and meters.
Introduction:
The teacher will first begin by grouping the students into pairs.
The teacher would give each group three different shapes, a rectangle, a triangle and a circle. The teacher will introduce the concept of perimeter, while relating the word with the given shapes. The students would be asked if they know what the word ‘perimeter’ means. Show them the jug of water and tell them that we would be finding its perimeter.
Procedure:
Step 1
The teacher prints the following definition on the board,
“Perimeter refers to the distance around a shape or an object.”
Indicate to them that the perimeter can not be round for liquids,
because they have no definite shape. Discuss this definition with the students. Ask them if they now think that we could find the perimeter of the pitcher of water.
Step 2
The teacher will distribute one meter stick, one ruler and one, thirty inch piece of string to each group. Let us look/observe the three flat shapes that were given. Which measuring instrument would be best used to find the perimeter of the circle? Let the student attempt to measure the circle using the three instruments given. They should soon discover that using the string then the ruler would be best. Let the students construct the following table in their books:
Objects Measuring Instruments Perimeter
Classroom
Math Book
Poster/Wall chart
Desk
Chalkboard
Window
Step 3
In each group, one person would be assigned as the recording and the other will measure the first three items on the table, then the roles would be reversed. Before assigning tasks, let the students observe the teacher. He/She would present a cardboard box on the task and demonstrate how to use all three methods/instruments to find the perimeter of the box. Let them know that the cardboard box is in the shape of a cuboid, so the perimeter of that cuboid must be found. Let the students practice on the given shapes. Assign all twelve groups to measure the listed objects. This task should take a maximum of the twenty minutes. Let the students record their findings in centimeters, inches or metres.
Closure:
Review the definition of the word ‘perimeter’ with the class. Solicit their personal understanding of the term ‘perimeter.’ As a class, review briefly the principles of measuring and the appropriate measuring tools for various objects.
Application:
Allow the students to complete the following tasks:
1. What is meant by the term perimeter?
2. What is perimeter used for?
3. How do we find the perimeter of objects?
4. Can we find the perimeter for every object that we come in contact with?
5. If you have to measure the size of a tree trunk what instrument would you use? Which two units of measurement are best to record the size of the tree trunk with?
Evaluation:
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Topic: Measuring
Sub topic: Perimeter
Grade: Three
Age: 7-9 years
Number of Students: 24
Number of Males: 11
Number of Females: 13
Time: 45 minutes
Objectives: At the end of this lesson students should be able to:
• Recall the basic principles of measuring.
• Apply rules or methods to assist in finding distances around various objects.
• Define the term ‘perimeter.’
• Select the most appropriate measuring tool for finding perimeters.
Instructional Materials:
12 metre sticks
2 balls of string
Flat cut-out shapes (various)
Jug of water
Empty cardboard box
Previous Knowledge:
• Students have demonstrated an understanding of how to measure using standard forms.
• Students possess the ability to guess (estimate) the length of various items.
• Students also demonstrate the knowledge of various units of measurements, such as inches, centimeters and meters.
Introduction:
The teacher will first begin by grouping the students into pairs.
The teacher would give each group three different shapes, a rectangle, a triangle and a circle. The teacher will introduce the concept of perimeter, while relating the word with the given shapes. The students would be asked if they know what the word ‘perimeter’ means. Show them the jug of water and tell them that we would be finding its perimeter.
Procedure:
Step 1
The teacher prints the following definition on the board,
“Perimeter refers to the distance around a shape or an object.”
Indicate to them that the perimeter can not be round for liquids,
because they have no definite shape. Discuss this definition with the students. Ask them if they now think that we could find the perimeter of the pitcher of water.
Step 2
The teacher will distribute one meter stick, one ruler and one, thirty inch piece of string to each group. Let us look/observe the three flat shapes that were given. Which measuring instrument would be best used to find the perimeter of the circle? Let the student attempt to measure the circle using the three instruments given. They should soon discover that using the string then the ruler would be best. Let the students construct the following table in their books:
Objects Measuring Instruments Perimeter
Classroom
Math Book
Poster/Wall chart
Desk
Chalkboard
Window
Step 3
In each group, one person would be assigned as the recording and the other will measure the first three items on the table, then the roles would be reversed. Before assigning tasks, let the students observe the teacher. He/She would present a cardboard box on the task and demonstrate how to use all three methods/instruments to find the perimeter of the box. Let them know that the cardboard box is in the shape of a cuboid, so the perimeter of that cuboid must be found. Let the students practice on the given shapes. Assign all twelve groups to measure the listed objects. This task should take a maximum of the twenty minutes. Let the students record their findings in centimeters, inches or metres.
Closure:
Review the definition of the word ‘perimeter’ with the class. Solicit their personal understanding of the term ‘perimeter.’ As a class, review briefly the principles of measuring and the appropriate measuring tools for various objects.
Application:
Allow the students to complete the following tasks:
1. What is meant by the term perimeter?
2. What is perimeter used for?
3. How do we find the perimeter of objects?
4. Can we find the perimeter for every object that we come in contact with?
5. If you have to measure the size of a tree trunk what instrument would you use? Which two units of measurement are best to record the size of the tree trunk with?
Evaluation:
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________