Learning Exercise

Understanding Measurement


- Ruler - Items around the classroom. - Caribbean Primary Mathematics textbook.


The following are the assessment strategies. 

1. Observation 2. Practical task 3. Pencil and paper exercise


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by the end of the lesson, students should have a better understanding of the concept of perimeter and how to find perimeter of any given object. 

Technical Notes

The perimeter of a shape is the distance around it. To measure the actual perimeter, you need to measure the length of each side and add up these lengths. If you know the lengths of the sides, you can simply calculate the sum. To measure a curved side, you can lay a piece of string along the edge and then measure the length of the string. You will use mm, cm, m or km to measure perimeter, depending on the size of the shape that you are measuring.


by the end of the lesson students should be able to:- 

- Discuss what the term perimeter means.

- Explain how the perimeter of a shape is calculated.

- Students are given items and are asked to measure the boundaries of each shape in mm or cm and calculate the perimeter.

- Students are asked to estimate and measure the perimeter of shapes found in the classroom.



Type of Task

Learning Objectives

By the end of the lesson, through drill and practice and practical task, pupils should be able to:

1. Measure and calculate the perimeter of shapes.  

2. Solve problems involving perimeter.


Estimate and measure the perimeter of the following items using both mm and cm.

1. Your textbook.

2. Your exercise/notebook.

3. Your desk.

4. The window.