Weight, Concept of Weight for Primary 1

Class: Primary 1
Term: Second Term
Week: 9
Age: 6 years
Duration: 45 minutes
Subject: Mathematics
Curriculum Theme: Measurement
Previous Lesson: Capacity, Comparison of Capacity of Containers.
Topic: Weight
Subject Matter: Concept of weight, Ordering of weight of objects

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

• Understand the concept of weight.
• Identify units of weight (e.g., kilogram, gram) in simple terms.

Affective Domain:

• Appreciate the importance of weight in daily life.
• Show curiosity about the weight of different objects.

Psychomotor Domain:

• Lift and compare the weights of different objects.
• Arrange objects from lightest to heaviest and vice versa.

Social Domain:

• Participate cooperatively in group activities to compare object weights.

Reference Materials

The following resources were used in planning this lesson:

• 9 Years Basic Education Curriculum
• State Unified Scheme of Work
• Primary 1 Mathematics Textbook

Instructional Materials

The teacher will teach this lesson with the aid of:

• A simple balance scale
• Various objects of different weights (e.g., stone, feather, book, cotton wool, pencil, eraser, small water bottle, toy car)
• Pictures of heavy and light objects

Rationale for the Lesson

Understanding weight helps pupils to compare objects in their environment and develop foundational measurement skills. This knowledge is important for everyday tasks such as carrying bags, buying items, and understanding physical properties of objects around them.

Prerequisite/Previous Knowledge

Pupils can identify different objects and understand basic concepts of size (big/small).

Lesson Content/Board Summary

Weight

Concept of Weight

Weight tells us how heavy or light an object is.

We use words like “heavy” and “light” to describe weight.

Some units used to measure weight are kilogram (kg) and gram (g).

Ordering of Weight of Objects

We can compare objects to see which is heavier or lighter.

We can also arrange objects from the lightest to the heaviest or from the heaviest to the lightest.

Example 1: Comparing two objects

• A feather is lighter than a book.
• A stone is heavier than a pencil.

Example 2: Ordering three objects

Imagine you have a feather, a book, and a stone.

• Lightest to Heaviest: Feather, Book, Stone
• Heaviest to Lightest: Stone, Book, Feather

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Weight

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to lift their school bags and then a pencil. The teacher then asks which one feels heavier.
Pupils’ Activity: Pupils lift the objects and respond that the school bag is heavier.
Learning Point: Pupils relate to the concept of heavy and light objects from personal experience.

Step 2: Explanation of Weight Concept

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher defines weight as how heavy or light something is. The teacher uses a balance scale to demonstrate how to compare the weights of two different objects (e.g., a book and a feather) and introduces the terms “heavier” and “lighter.”
Pupils’ Activity: Pupils watch the demonstration and listen to the explanation. They identify which object is heavier or lighter.
Learning Point: Pupils understand the concept of weight and the terms “heavier” and “lighter.”

Step 3: Practical Comparison of Objects

Time: 10 minutes
Teaching Skill: Practical/Activity
Teacher’s Activity: The teacher distributes various objects (e.g., stone, cotton wool, eraser, water bottle) to groups of pupils. Pupils are instructed to lift and compare the objects within their groups and determine which ones are heavier or lighter.
Pupils’ Activity: Pupils actively lift, compare, and discuss the weights of the objects in their groups.
Learning Point: Pupils develop hands-on experience in comparing the weights of different objects.

Step 4: Introduction to Ordering Weight

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains that objects can be arranged based on their weight, either from the lightest to the heaviest or from the heaviest to the lightest. The teacher uses three distinct objects to model this ordering on the board.
Pupils’ Activity: Pupils observe the teacher’s demonstration and understand how to order objects by weight.
Learning Point: Pupils learn the principle of ordering objects based on their weight.

Step 5: Practical Ordering of Objects

Time: 5 minutes
Teaching Skill: Group Activity
Teacher’s Activity: The teacher provides each group with three to four objects of noticeably different weights and asks them to arrange the objects from the lightest to the heaviest and then from the heaviest to the lightest.
Pupils’ Activity: Pupils work in groups to arrange the objects according to their weight.
Learning Point: Pupils practice ordering multiple objects based on their weight.

Step 6: Discussion on Units of Weight

Time: 5 minutes
Teaching Skill: Information Giving
Teacher’s Activity: The teacher briefly introduces the common units for measuring weight, such as kilogram (kg) and gram (g), explaining simply that these are words we use to tell how much something weighs.
Pupils’ Activity: Pupils listen and repeat the names of the units.
Learning Point: Pupils are introduced to the basic units used for measuring weight.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. What does “weight” tell us about an object?
2. Mention two objects from the classroom, one that is heavy and one that is light.
3. If you have a feather, a book, and a stone, how would you arrange them from the lightest to the heaviest?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the key points of the lesson on weight, emphasizing the comparison and ordering of objects. The teacher then assigns homework for pupils to identify five heavy and five light objects at home.
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils consolidate their understanding and apply it to their home environment.

Home Task: Solve two new exercises on Weight. Show each step and check each answer.

Lesson Keywords

• Weight – How heavy or light something is.
• Heavy – Having a lot of weight.
• Light – Not having much weight.
• Heavier – More weight than another object.
• Lighter – Less weight than another object.

Differentiation

For struggling learners, the teacher will provide more one-on-one guidance during practical activities and use simpler objects for comparison. Advanced learners will be encouraged to find more objects and create more complex ordering sequences, explaining their reasoning.

Note for teachers using this lesson plan

Ensure a variety of objects with clearly distinguishable weights are available for practical activities. Encourage pupils to use descriptive words like “heavier than” and “lighter than” when comparing objects. Safety should be considered when selecting objects for comparison.