Mass or Weight Measurement

Subject : 

Basic Science and Technology

Term :

First   Term / 1st Term


Week 2

Class :

Basic 3 / Year 3 / Primary 3


Previous lesson : 

The pupils have previous knowledge of linear or length measurement in their previous lesson


Topic: Measurement of Weight of Objects 

Subtitle: Mass Measurement 


Behavioural objectives :

At the end of the lesson, the pupils should be able to

  • Explain the meaning of mass
  • Explain the meaning of mass measurement
  • Mention the tools that are use in measuring the mass of objects

Instructional Materials :

  • Wall charts
  • Pictures
  • Related Online Video
  • Flash Cards
  • Bathroom Scale
  • Scale measure
  • Spring Scale measure or spring balance

Methods of Teaching :

  • Class Discussion
  • Group Discussion
  • Asking Questions
  • Explanation
  • Role Modelling
  • Role Delegation


Reference Materials :

  • Scheme of Work
  • Online Information
  • Textbooks
  • Workbooks
  • 9 Year Basic Education Curriculum
  • Workbooks


Content :

Mass refers to how heavy an object is . Mass measurement is use to calculate or measure the heaviness or weight of objects . The objects that are used to measure weight or mass are spring balance , scale , etc.

The basic unit of measuring mass is Gram. Other units or measuring weight are

10 milligram make 1 centigram

10 centigram make 1 decigram

10 decigram make 1 gram

1000 grams make 1 kilograms\



We can measure the weight of our bag

We can measure the weight of our body .

We can measure the weight of our books

What is the weight of a bag of rice ?

What is the weight of a bag of cement ?


Please note that 

200 centigram = 2 grams (2 x 100 )

1000 grams = 1 kilogram

4000 grams = 4 kilograms




The topic is presented step by step


Step 1:

The class teacher revises the previous topics


Step 2.

He introduces the new topic


Step 3:

The class teacher allows the pupils to give their own examples and he corrects them when the needs arise




The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where  the needs arise.



1. Measure your weight and record it somewhere .

2. Mention three instrument for measuring mass or weight

3. convert 500 centigrams to grams

4. What is the weight of your bag

5. Convert 2 kilogram to grams

6. Change 300 decigrams  to kilograms





Prepare for the next lesson by reading about  mass or weight measurement



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