Class: primary Three
Term: Third Term
Subject: General Mathematics
Curriculum Theme:
Previous Lesson: Introduction to Weight & Units of measuring weight
topic: Units of Weight
Content/Learning Area: Metric table of units of weight, Conversion of units of weight, Mathematical problems involving weight, Addition and subtraction of weight, Multiplication of weight by one-digit and two-digit numbers
time Allocation: 40 minutes
Table Of Content
- Performance Objectives
- Reference Materials
- Instructional Materials
- Rationale for the Lesson
- Prerequisite/Previous Knowledge
- Lesson Content
- Metric Table of units of Weight
- Conversion of Units of Weight
- Mathematical Problems Involving Weight
- Addition and Subtraction of Weight
- Multiplication of weight by One-Digit and Two-Digit Numbers
- Teaching Methods
- Instructional Procedures
- Step 1: Introduction
- step 2: Explanation of key Concepts
- Step 3: Presentation/Guided Practice
- Step 4: Independent Practice
- Step 5: Note-Taking
- Step 6: Evaluation/Review
- Step 7: Conclusion
- Lesson Keywords
- Lesson Evaluation
- Assignment/Homework
- Differentiation
- Note for teachers
Performance Objectives
By the end of the lesson, pupils should be able to:
- Cognitive Domain:
1. Identify the basic units of weight in the metric system.
2. Explain how to convert between different units of weight (milligrams, grams, kilograms).
3. Solve mathematical problems involving weight using addition, subtraction, and multiplication.
- Affective Domain:
1. Show interest in learning about units of weight.
2. Appreciate the importance of accurate weight measurement in daily life.
- Psychomotor Domain:
1. Accurately perform calculations involving weight conversions.
2. Use measuring tools to determine the weight of objects.
- Social Domain:
1. Work collaboratively with peers to solve problems.
2. Actively participate in class discussions.
Reference Materials
- 9 – Years Basic Education Curriculum
- Abuja Educational Resource Center Scheme of Work
- NAPPS National Unified Scheme of Work
- Online Information
- Relevant Textbooks
Instructional Materials
To deliver this lesson, the teacher will use the following materials: Whiteboard or chart, Markers or pens, Worksheet with practice problems, Measuring scales (optional).
Rationale for the Lesson
Understanding units of weight is crucial for everyday tasks and further studies in science and mathematics. This lesson builds upon prior knowledge and provides a foundation for more complex measurement concepts.
Prerequisite/Previous Knowledge
The teacher will begin by asking pupils about their experiences with weight in daily life (e.g.,weighing groceries,themselves).A brief review of the previous lesson on weight will be conducted.
Lesson Content
Metric Table of units of Weight
The metric system uses grams (g) as the base unit for weight. Here’s a table showing the relationship between milligrams, grams, and kilograms:
- 1 gram (g) = 1000 milligrams (mg)
- 1 kilogram (kg) = 1000 grams (g)
- 1 tonne (t) = 1000 kilograms (kg)
Conversion of Units of Weight
Converting between units involves multiplying or dividing by powers of 10.These include:
- To convert grams to milligrams, multiply by 1000.
- To convert kilograms to grams, multiply by 1000.
- To convert milligrams to grams, divide by 1000.
- To convert grams to kilograms, divide by 1000.
- To convert kilograms to tonnes,divide by 1000.
- To convert tonnes to kilograms, multiply by 1000.
Mathematical Problems Involving Weight
Weight problems often require addition, subtraction, multiplication, or division. Examples are:
- Adding the weights of multiple items.
- Finding the difference in weight between two objects.
- Calculating the total weight of several identical items.
Addition and Subtraction of Weight
When adding or subtracting weights, ensure the units are the same. If not,convert them first. Examples include:
- Adding 250g and 500g.
- Subtracting 300g from 1kg (convert 1kg to 1000g first).
- Adding 1.5kg and 750g (convert 1.5kg to 1500g first).
- Subtracting 500mg from 2g (convert 2g to 2000mg first).
Multiplication of weight by One-Digit and Two-Digit Numbers
This involves multiplying a weight value by a whole number. Examples are:
- Finding the total weight of 5 bags of rice,each weighing 5kg.
- Calculating the total weight of 12 boxes, each weighing 2.5kg.
- Determining the total weight of 25 items, each weighing 150g.
- finding the total weight of 8 containers, each weighing 3.2kg.
Teaching Methods
To deliver this lesson, the teacher will adopt the following methods: Explanation,Exhibition,Question and Answer,Group work,Practice exercises.
Instructional Procedures
To deliver this lesson, the teacher will adopt the following steps:
Step 1: Introduction
Time: 5 minutes
Teaching Skill: set Induction
Teacher’s Activity: Review previous lesson on weight. Introduce the topic of units of weight.
Pupils’ Activity: Respond to teacher’s questions, listen attentively.
step 2: Explanation of key Concepts
Time: 10 minutes
Teaching Skill: Explanation
Teacher’s Activity: Explain the metric table of units of weight (milligrams, grams, kilograms).Show examples of objects with different weights.
Pupils’ Activity: Listen attentively, take notes.
Step 3: Presentation/Guided Practice
time: 10 minutes
Teaching Skill: Demonstration
Teacher’s Activity: Demonstrate weight conversions using examples. Guide pupils through solving simple problems.
Pupils’ Activity: Observe the demonstration, participate in guided practice.
Step 4: Independent Practice
Time: 10 minutes
Teaching Skill: Monitoring
Teacher’s Activity: provide worksheets with practice problems. Monitor pupils’ progress and provide assistance.Pupils’ Activity: Solve problems independently, ask for help when needed.
Step 5: Note-Taking
Time: 2 minutes
Teaching Skill: Note-taking
Teacher’s Activity: Guide pupils in summarizing key concepts and formulas.
Pupils’ Activity: take notes, summarize key information.
Step 6: Evaluation/Review
Time: 3 minutes
Teaching Skill: Questioning
Teacher’s Activity: Ask questions to assess understanding. Review key concepts.
Pupils’ Activity: Answer questions, participate in review.
Step 7: Conclusion
Time: 0 minutes
Teaching Skill: Closure
Teacher’s Activity: Summarize the lesson and highlight the importance of understanding units of weight.Pupils’ Activity: Listen attentively.
Lesson Keywords
- Milligram (mg) – A unit of mass equal to one thousandth of a gram.
- Gram (g) – The base unit of mass in the metric system.
- Kilogram (kg) – A unit of mass equal to 1000 grams.
- Tonne (t) – A unit of mass equal to 1000 kilograms.
- Conversion – The process of changing from one unit of measurement to another.
Lesson Evaluation
To evaluate the learning, the teacher asks pupils to:
1. convert 5 kg to grams.
2. Add 250g and 750g.
3. Subtract 400mg from 1g.
4. Multiply 2.5kg by 4.
5. Explain the relationship between grams and kilograms.
Assignment/Homework
1. Convert the following weights:
3 kg to grams
5000 mg to grams
2 tonnes to kilograms
2. Solve the following problems:
A bag of rice weighs 10 kg. What is the total weight of 3 bags?
* A box contains two items: one weighs 300g and the other weighs 450g. What is the total weight of the items in the box?
3. Explain why it is crucial to know how to convert units of weight.
Differentiation
- For slower learners: Provide extra practice with basic conversions and simpler problems. Use visual aids and hands-on activities.
- For advanced learners: Challenge them with more complex problems involving multiple steps and conversions. Encourage them to create their own weight-related problems.
- For visual/auditory/kinesthetic learners: Use measuring scales and real objects to demonstrate weight. Encourage movement and active participation in problem-solving.
Note for teachers
Ensure pupils understand the relationship between different units of weight.Provide plenty of practice problems to reinforce their understanding. Use real-life examples to make the lesson more engaging.
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