Class: Basic 3
Term: 3rd Term
Week: 2
Age: 8 – 9 years
Duration: 45 minutes
Subject: Mathematics
Curriculum Theme: Measurement
Previous Lesson: Introduction to Weight (Weight I)
Topic: Weight II
Content/Learning Area:
- Conversion of Units of Weight
- Addition and Subtraction of Weight
- Multiplication of Weight
Performance Objectives
By the end of the lesson, pupils should be able to: Cognitive Domain: Convert weight units from milligrams to grams and grams to kilograms accurately.
Affective Domain: Demonstrate enthusiasm and teamwork while solving weight-related math problems.
Psychomotor Domain: Solve weight conversion and calculation problems using appropriate techniques.
Social Domain: Collaborate effectively in group problem-solving activities.
Instructional Materials
To deliver this lesson, the teacher will use the following materials:
- Whiteboard and markers
- Worksheets with weight-related problems
- Measuring scales
- Objects of various weights (e.g. fruits, books)
Reference Materials
The following resources were used in planning this lesson:
- Nigerian 9 – Years Basic Education Curriculum
- Abuja Educational Resource Centre Scheme of Work
- NAPPS National Unified Scheme of Work
- Conversion Tables and Methods to Use when converting: https://www.mathsisfun.com/weights.html
- Units of Weight Conversion Formulas : Metric: https://byjus.com/us/math/units-of-weight-conversion-formulas-metric/
Rationale for the Lesson
Understanding how to convert and compute weight is a crucial life skill that aids pupils in interpreting real-life situations such as measuring food, luggage, and health-related weight metrics.
Prerequisite/Previous Knowledge
Pupils already understand the concept of weight and can identify basic weight units such as grams and kilograms.
Lesson Content
Weight II
Weight is the measure of how heavy something is. It is often measured in milligrams (mg), grams (g), or kilograms (kg), depending on the size or mass of the object.
Conversion of Units of Weight
To solve problems involving weight, we often need to change from one unit to another. Here are the basic conversion rules we will use:
- Milligrams to Grams: To convert milligrams to grams, we divide by 1000 because there are 1000 milligrams in 1 gram. $$\text{grams (g)} = \frac{\text{milligrams (mg)}}{1000}$$
- Grams to Milligrams: To convert grams to milligrams, we multiply by 1000. $$\text{milligrams (mg)} = \text{grams (g)} \times 1000$$
- Grams to Kilograms: To convert grams to kilograms, we divide by 1000 because there are 1000 grams in 1 kilogram. $$\text{kilograms (kg)} = \frac{\text{grams (g)}}{1000}$$
- Kilograms to Grams: To convert kilograms to grams, we multiply by 1000. $$\text{grams (g)} = \text{kilograms (kg)} \times 1000$$
- Milligrams are used for very light things (like medicine doses).
- Grams are used for moderately light things (like fruits).
- Kilograms are used for heavier things (like a sack of rice).
Conversion Facts:
Here are the basic conversion rules we will use:
- 1,000 milligrams (mg) = 1 gram (g)
- 1,000 grams (g) = 1 kilogram (kg)
Example:
To convert 5,000 mg to grams:
= 5,000 ÷ 1,000 = 5 g
To convert 3,000 g to kilograms:
= 3,000 ÷ 1,000 = 3 kg
Addition and Subtraction of Weight
When adding or subtracting weights, the units must be the same.
Example:
A bag of rice weighs 35 kg, and another bag weighs 25 kg. What is the total weight? = 35 kg + 25 kg = 60 kg
If a boy weighs 50 kg and he loses 5 kg:
= 50 kg – 5 kg = 45 kg
Multiplication of Weight by 1- or 2-Digit Numbers
Weight can also be multiplied to find totals when we have multiple objects of the same weight.
Example:
If one mango weighs 150 g, how much do 4 mangoes weigh?
= 150 g × 4 = 600 g
If a carton of milk weighs 2 kg, how much do 12 cartons weigh?
= 2 kg × 12 = 24 kg
Teaching Methods
To deliver this lesson, the teacher will adopt the following methods: Discussion, Lecture, Demonstration, Group Work, Visual Aids, Question and Answer
Instructional Procedures
To deliver this lesson, the teacher will adopt the following steps:
| Content Development | Time | Teaching Skills | Teacher’s Activity | Pupils’ Activity | Learning Point |
|---|---|---|---|---|---|
| Step 1: Introduction | 5 mins | Set Induction | Reviews previous lesson on weight, asks pupils to recall units of weight | Participate and respond to questions | Recall of previous knowledge |
| Step 2: Meaning and Units of Weight | 7 mins | Explanation, Visual Aid | Explains weight and displays real objects with labels in mg, g, and kg | Observe and ask questions | Understand basic units of weight |
| Step 3: Conversion of Weight Units | 10 mins | Demonstration | Demonstrates conversion using board examples and real-life items | Practice converting weights | Understand and perform weight conversions |
| Step 4: Addition and Subtraction of Weight | 10 mins | Guided Practice | Solves examples on board and guides pupils in pairs | Solve problems in pairs | Apply math operations to weight |
| Step 5: Multiplication of Weight | 10 mins | Group Work | Poses multiplication word problems; pupils solve in groups | Collaborate and solve problems | Multiply weights correctly |
| Step 6: Note Taking | 2 mins | Explanation | Writes key points on board for pupils to copy | Copy into notebooks | Retain key concepts |
| Step 7: Evaluation | 3 mins | Questioning | Asks oral questions to assess understanding | Answer questions | Demonstrate knowledge |
| Step 8: Conclusion | 3 mins | Cognitive, Social Closure | Summarizes lesson, praises pupils’ participation, assigns homework | Listen and take homework | Reinforcement and closure |
Lesson Keywords (Key terms used in the lesson)
Weight – A measure of how heavy something is
Milligram (mg) – A very small unit of weight
Gram (g) – A basic unit of weight used for small objects
Kilogram (kg) – A unit of weight for heavier items
Convert – To change from one unit to another
Lesson Evaluation
- Convert 5,000 mg to grams.
- How many grams are in 3 kilograms?
- Add 45 kg and 20 kg.
- Subtract 15 kg from 60 kg.
- Multiply 1.5 kg by 4.
Assignment/Homework
- Convert 8,000 mg to g
- If a chair weighs 9 kg, what will 6 chairs weigh?
- Find the total weight of 12 packets of milk if one packet weighs 250 g.
Differentiation
For slower learners: Provide simpler conversion charts and step-by-step guidance using real objects.
For advanced learners: Introduce decimal conversions and multi-step word problems.
For visual/auditory/kinesthetic learners: Use charts, oral explanations, and hands-on weighing activities to cater to diverse styles.
Note for Teachers
Ensure students grasp conversion basics before introducing computations. Use practical items to improve engagement and understanding. Reinforce learning with real-life scenarios.