# Lesson Plan: Understanding Mass & Capacity
## Grade: Primary 3
### Topic: Mass/Capacity
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### Objectives:
1. **Identify** different units of mass (grams, kilograms) and capacity (milliliters, liters).
2. **Measure** and **compare** the mass and capacity of various objects.
3. **Develop** an understanding of the practical uses of measuring mass and capacity in everyday life.
### Materials Needed:
- Digital scale
- Measuring cups/jugs
- A variety of objects with different weights (e.g., pencils, erasers, books)
- Different containers (e.g., cups, bottles, jugs)
- Water
- Sand
- Worksheets with related problems
- Interactive whiteboard or projector
### Time: 90 minutes
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### Lesson Outline:
#### 1. Introduction (10 minutes)
- **Greeting and Setting the Scene:** "Good morning, students! Today, we're going to learn about mass and capacity. These are important concepts that help us understand how heavy things are and how much they can hold."
- **Discuss Real-life Examples:** Ask, "Can anyone tell me when you might need to know how heavy something is or how much a container can hold?"
#### 2. Explanation and Demonstration (15 minutes)
- **Define Mass and Units:**
- **Mass**: The amount of matter in an object. Measured in grams (g) and kilograms (kg).
- **Examples:** Show a digital scale. Measure and show the weight of a pencil, eraser, and a book.
- **Define Capacity and Units:**
- **Capacity**: The amount of liquid a container can hold. Measured in milliliters (ml) and liters (L).
- **Examples:** Show different containers and measure the amount of water each can hold using measuring cups/jugs.
#### 3. Interactive Activity - Measuring and Comparing Mass (20 minutes)
- **Group Activity:**
- Split the class into small groups.
- Provide each group with a digital scale and a set of objects.
- **Task:** Measure the mass of each object and record it on the provided worksheet.
- **Discussion:** “Which object is the heaviest/lightest? How do you know?”
#### 4. Interactive Activity - Measuring and Comparing Capacity (20 minutes)
- **Group Activity:**
- Give each group different containers and measuring cups/jugs.
- **Task:** Measure and compare the capacity of each container with water or sand and record it.
- **Discussion:** “Which container holds the most/least? How do you know?”
#### 5. Individual Practice (15 minutes)
- **Worksheet Activity:** Distribute worksheets with problems related to mass and capacity.
- Questions might include: "How much heavier is object A than object B?" or "Which container has greater capacity, Container X or Y?"
- Circulate and assist students as needed.
#### 6. Recap and Reflection (5 minutes)
- **Review Key Points:** Reiterate the definitions and key units of mass and capacity.
- **Q&A Session:** "What did you learn about mass? What did you learn about capacity?"
- **Real-life Application:** Briefly discuss how they might use these skills at home or in the community.
#### 7. Closing (5 minutes)
- **Summarize the Lesson:** "Today, we learned about mass and capacity, and how to measure and compare them."
- **Preview the Next Lesson:** "Next time, we'll explore how to solve problems involving mass and capacity in different scenarios."
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### Assessment:
- Observe students' engagement and participation during group activities.
- Review accuracy and completeness of the worksheets.
- Ask questions during the recap session to gauge understanding.
### Homework:
- **Worksheet Exercise:** Provide additional problems for the students to practice at home.
- **Practical Activity:** Ask students to measure the mass of three objects at home and estimate the capacity of two containers.
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This lesson plan provides a balanced mix of theoretical knowledge, practical activities, and individual practice to help Primary 3 students understand mass and capacity.