Hello, everyone! Welcome to our Basic Science class for Primary 3. In the previous lesson, we learned about modern means of transportation. Today, we’re going to learn about Measurement of Length.
Objectives
By the end of this lesson, you should be able to:
- Explain the meaning of length
- Identify and mention various instruments for measuring length
- Identify the metric units of measuring length
- Mention professionals who deal with measurement of length
- Measure length of objects around them using both olden and standard methods
Measurement of Length
What is Length?
Length is the distance between two points or how long something is from one end to the other. We measure length using tools like tape measures, rulers, and meter sticks. In the past, people used handspan, stride, feet, or other body parts to estimate length.
Metric Units of Length
In metric measurement, we use units like millimeters (mm), centimeters (cm), meters (m), and kilometers (km). Each unit is used depending on the size of the object we are measuring. The following is a table of the unit of length from the shortest to the longest:
| Unit | Equivalent |
|---|---|
| millimetre (mm) | 10 millimetres = 1 decimetre |
| decimetre (dm) | 10 decimetres = 1 centimetre |
| centimetre (cm) | 10 centimetres = 1 metre |
| metre (m) | 1000 metres = 1 kilometre |
| kilometre (km) | 1000 metres = 1 kilometre |
Professionals Who Measure Length
Some of the professionals who measure length include carpenters, engineers, and scientists. They use precise tools to measure length accurately for building, designing, and experimenting.
Example of Measurement
Imagine measuring the length of your classroom. You might use a meter stick to measure the length in meters (m) or a tape measure in centimeters (cm). This helps us understand how big or small things are.
Evaluation Questions
Now that you’ve learned about Measurement of Length, let’s see if you can answer these questions:
- What is the meaning of length?
- What are some tools used for measuring length?
- What are the metric units of measuring length?
- What are some professions that involve measuring length? 5. How can you measure the length of an object using both olden and standard methods?
Conclusion
Learning about measurement of length helps us understand the world around us better. I hope you enjoyed the lesson, leave a comment and see you in the next lesson.
