HomePrimary 3MathematicsWeight Measurement Made Easy Primary 3 Mathematics Third Term Lesson Notes Week 6

Weight Measurement Made Easy Primary 3 Mathematics Third Term Lesson Notes Week 6

Lesson Plan Presentation:

Topic – Units of Weight Measurement: Grams and Kilograms

Grade Level: Primary 3

Duration: 45 minutes

Learning Objectives:

  1. Understand the units of weight measurement: grams and kilograms.
  2. Differentiate between grams and kilograms and their appropriate use for measuring objects.
  3. Develop the ability to convert between grams and kilograms.
  4. Apply knowledge of units of weight measurement in real-life scenarios.

Embedded Core Skills:

  1. Numeracy Skills: Counting, comparing, and estimating weights.
  2. Critical Thinking: Analyzing and determining the appropriate unit of measurement.
  3. Communication Skills: Expressing ideas and understanding weight-related concepts.
  4. Problem Solving: Applying knowledge of units of weight measurement to solve problems.

Learning Materials:

  1. Whiteboard or chart paper
  2. Markers
  3. Scale or balance
  4. Objects of different weights (e.g., pencil, apple, textbook, watermelon)
  5. Worksheets or handouts for assessment

COMPARING WEIGHT

A bottle of water weigh more than an empty bottle

A sister weighs less than a mug

A mathematics textbook weighs more than an exercise book.

 

Activity

 

  1. Weigh the objects and record their weights in kilograms or grams.
  2. 6 packets of whiteboard markers 2. 3 tins of Milo
  3. 1 mathematics textbook 4. 1 bottle of water
  4. 10 packets of pencils 6. 1 tin of milk
  5. 1 bag of Semolina 8. 1 packet of biscuits
  6. 2 big tins of Peak Milk

Standard units of weight

We need to use standard units to measure weight.

The kilogram (kg) is used as a unit when weighing heavy objects like

bags of rice, bags of cement, etc.

The gram (g) is used when weighing lighter objects like pencils, rulers, etc.

Measuring and estimating weight

These are different types of weighing scales

O

 

Exercise 2

 

Classify these objects according to their weight in grams and kilograms.

Name of objects      Weight in grams (g)     Weight in kilogram (kg)

  1. Bottle of water
  2. Pencil
  3. Eraser
  4. Bag of sugar
  5. Jug
  6. Ruler
  7. Stone
  8. Bottle of Fanta

Name of objects       Weight in grams (g)      Weight in kilogram (kg)

  1. Toothbrush
  2. Orange
  3. Rock
  4. Scissors
  5. 5 tins of Milo
  6. A bundle of nails
  7. 2 notebooks
  8. A baby boy

Grams and kilograms

1000 grams (g) = 1 kilogram (kg)

 

short form short form

We can convert weights in grams to kilograms and weights in kilograms to grams

Examples

2 kg = 1000 g + 1000 g = 2000 g

1/2kg = 1000 g ÷ 2 g = 500 g

2000 g = 2000 g ÷ 1000 g = 2 kg

 

Good morning, class! Today, we’re going to learn about measuring the weights of smaller and bigger objects. Are you all ready to dive into the world of weights? Great!

 

Now, before we begin, let’s quickly review what weight means. Weight is a measure of how heavy or light an object is. We use different units to measure weight, such as grams (g) and kilograms (kg).

 

Okay, let’s start with smaller objects. When we want to measure the weight of smaller objects, like a pencil or an apple, we use grams. Grams are a smaller unit of measurement. You can think of them like tiny weights. We use a scale or a balance to measure the weight of these smaller objects.

 

Let’s say we have a pencil. We put it on a scale, and it shows 10 grams. That means the weight of the pencil is 10 grams. Can you all try to think of some other small objects and guess their weights in grams?

 

Now, let’s move on to bigger objects. When we have larger objects, like a textbook or a watermelon, we use kilograms to measure their weight. Kilograms are a bigger unit of measurement compared to grams. They represent larger amounts of weight.

 

Imagine we have a watermelon. We place it on a scale, and it shows 2 kilograms. That means the weight of the watermelon is 2 kilograms. Can anyone give me an example of another big object and estimate its weight in kilograms?

 

Remember, when measuring weights, smaller objects use grams, and bigger objects use kilograms. It’s important to use the appropriate unit of measurement for the object’s size.

 

Now, let’s practice a little. I’m going to give you some examples, and I want you to tell me if we should use grams or kilograms to measure their weight.

 

Example 1: A small toy car. Should we use grams or kilograms?

Example 2: A bag of rice. Should we use grams or kilograms?

Example 3: A chair. Should we use grams or kilograms?

 

Well done, everyone! You’ve learned how to measure the weights of smaller and bigger objects using grams and kilograms. Keep practicing, and soon you’ll become experts in measuring weights!

[mediator_tech]

Evaluation

 

1. A small pencil is measured in __________.

a) grams

b) kilograms

c) liters

 

2. A watermelon is measured in __________.

a) grams

b) kilograms

c) meters

 

3. To measure the weight of a small toy, we use __________.

a) grams

b) kilograms

c) centimeters

 

4. When an object is heavy, it usually has a weight in __________.

a) grams

b) kilograms

c) millimeters

 

5. To measure the weight of a school bag, we use __________.

a) grams

b) kilograms

c) seconds

 

6. A textbook is usually measured in __________.

a) grams

b) kilograms

c) degrees

 

7. When we want to measure the weight of a feather, we use __________.

a) grams

b) kilograms

c) liters

 

8. A weighing scale is used to measure weights in __________.

a) grams

b) kilograms

c) meters

 

9. A heavy rock is likely to have a weight in __________.

a) grams

b) kilograms

c) kilometers

 

10. The unit used to measure the weight of a baby is __________.

a) grams

b) kilograms

c) liters

 

Remember, choose the most appropriate option for each question. Good luck!

 

 

Second Lesson

Building our counting skills by exploring the numbers from 921 to 940.

Are you all ready to dive into this exciting lesson? Great!

 

Let’s begin by counting from 921 to 930 together:

 

921, 922, 923, 924, 925, 926, 927, 928, 929, 930.

 

Now, let’s take a closer look at these numbers. The number 921 has a 9 in the hundreds place, a 2 in the tens place, and a 1 in the ones place. Each digit in a number has a specific value. Can anyone tell me the value of each digit in the number 921?

 

– The digit 9 in the hundreds place represents 9 hundreds, which is 900.

– The digit 2 in the tens place represents 2 tens, which is 20.

– The digit 1 in the ones place represents 1 one.

 

When we put these values together, we get 900 + 20 + 1, which equals 921. This process helps us understand the place value of each digit and how they contribute to the overall value of a number.

 

Now, let’s continue counting from 931 to 940:

 

931, 932, 933, 934, 935, 936, 937, 938, 939, 940.

 

Just like before, let’s examine the number 940. The digit 9 is in the hundreds place, the digit 4 is in the tens place, and the digit 0 is in the ones place. What are the values of each digit in the number 940?

 

– The digit 9 in the hundreds place represents 9 hundreds, which is 900.

– The digit 4 in the tens place represents 4 tens, which is 40.

– The digit 0 in the ones place represents 0 ones.

 

Putting these values together, we have 900 + 40 + 0, which equals 940.

 

Now, let’s do a quick activity. I’ll give you some numbers between 921 and 940, and I want you to tell me the value of each digit in those numbers.

 

1. 925:

– Hundreds place: _____

– Tens place: _____

– Ones place: _____

 

2. 937:

– Hundreds place: _____

– Tens place: _____

– Ones place: _____

 

3. 932:

– Hundreds place: _____

– Tens place: _____

– Ones place: _____

 

Great job, everyone! You’re doing fantastic with your counting skills. Remember to pay attention to the value of each digit in a number and how they contribute to the overall value of the number. Keep practicing, and soon you’ll be counting with ease!

 

[mediator_tech]

 

Evaluation

 

1. Fill in the blank: 921, 922, 923, ______, 925.

a) 924

b) 926

c) 920

 

2. Fill in the blank: 928, 929, 930, ______, 932.

a) 931

b) 933

c) 925

 

3. Fill in the blank: 934, 935, ______, 937, 938.

a) 936

b) 932

c) 940

 

4. Fill in the blank: 939, _______, 941, 942, 943.

a) 938

b) 940

c) 936

 

5. Fill in the blank: 942, _______, 944, 945, 946.

a) 940

b) 943

c) 948

 

6. Fill in the blank: 948, _______, 950, 951, 952.

a) 945

b) 947

c) 949

 

7. Fill in the blank: 921, 922, 923, 924, _______.

a) 925

b) 920

c) 926

 

8. Fill in the blank: 930, 931, _______, 933, 934.

a) 932

b) 935

c) 929

 

9. Fill in the blank: 936, 937, 938, _______, 940.

a) 939

b) 935

c) 941

 

10. Fill in the blank: 941, _______, 943, 944, 945.

a) 942

b) 946

c) 940

 

Remember to choose the correct option that fills in the blank to complete the sequence. Great job, class! Keep practicing your counting skills, and you’ll become masters in no time!

[mediator_tech]

 

Further Explanation Comparing Weight by focusing on grams and kilogram

Good morning, class! Today, we’re going to dive deeper into the topic of units of weight measurement. Specifically, we’ll be focusing on two units: grams and kilograms. Are you all ready to explore the world of weight measurement? Fantastic!

Let’s start with grams. Grams are used to measure the weight of smaller objects. You can think of grams as tiny weights. When we want to know how heavy or light something is, like a pencil, a book, or even a fruit, we use grams to measure its weight.

To give you an idea of the weight of certain objects in grams:
– A small pencil may weigh around 10 grams.
– An apple may weigh around 200 grams.
– A paperback book may weigh around 500 grams.

We use a scale or a balance to measure weights in grams. When you place an object on the scale, it will show you the weight in grams.

Now, let’s move on to kilograms. Kilograms are used to measure the weight of larger objects or heavier things. When something is quite heavy, like a person, a sack of rice, or a watermelon, we use kilograms to measure its weight.

To understand the weight of certain objects in kilograms:
– A small child may weigh around 20 kilograms.
– A sack of rice may weigh around 10 kilograms.
– A watermelon may weigh around 5 kilograms.

Just like with grams, we use a scale or a balance to measure weights in kilograms. The scale will display the weight in kilograms.

It’s important to understand that there are 1,000 grams in 1 kilogram. That means if we have 1 kilogram of apples, we have 1,000 grams of apples.

Let’s practice a little! I’m going to give you some examples, and I want you to tell me if we should use grams or kilograms to measure their weight:

1. A small feather:
– Should we use grams or kilograms?

2. A bag of flour:
– Should we use grams or kilograms?

3. A truck:
– Should we use grams or kilograms?

Well done, everyone! You’ve learned about the units of weight measurement: grams and kilograms. Remember, grams are used for smaller objects, while kilograms are used for larger or heavier objects. Keep practicing, and soon you’ll become experts in measuring weights!

[mediator_tech]

Evaluation

1. Fill in the blank: Smaller objects are measured in _________.

a) liters

b) grams

c) meters

 

2. Fill in the blank: Kilograms are used to measure the weight of _________.

a) heavier objects

b) longer objects

c) smaller objects

 

3. Fill in the blank: A small pencil may weigh around _________ grams.

a) 100

b) 10

c) 1000

 

4. Fill in the blank: A sack of rice may weigh around _________ kilograms.

a) 5

b) 10

c) 50

 

5. Fill in the blank: Kilograms have _________ grams.

a) 100

b) 1000

c) 10

 

6. Fill in the blank: A truck is typically weighed in _________.

a) liters

b) grams

c) kilograms

 

7. Fill in the blank: If we have 500 grams of flour, it is equivalent to _________ kilograms.

a) 0.5

b) 5

c) 50

 

8. Fill in the blank: A small child may weigh around _________ kilograms.

a) 20

b) 2

c) 200

 

9. Fill in the blank: A paperback book may weigh around _________ grams.

a) 5000

b) 50

c) 500

 

10. Fill in the blank: When measuring the weight of smaller objects, we use a _________.

a) ruler

b) scale

c) calculator

 

Remember to choose the correct option that fills in the blank. Great job, class! Keep practicing your understanding of units of weight measurement, and soon you’ll be experts in measuring weights in grams and kilograms!

 

[mediator_tech]

 

Presentation:

Revision

Revise the previous lesson (2 minutes)

  1. Introduction (5 minutes)
    • Greet the students and review the previous lessons on counting skills and units of weight measurement.
    • Share the learning objectives for today’s lesson.
  2. Concept Explanation (10 minutes)
    • Define the units of weight measurement: grams and kilograms.
    • Explain that grams are used for smaller objects, while kilograms are used for larger or heavier objects.
    • Provide examples of objects and their typical weights in grams and kilograms.
  3. Teacher’s Activities (15 minutes)
    • Demonstrate how to measure the weight of objects using a scale or balance.
    • Show the conversion between grams and kilograms (1 kilogram = 1000 grams).
    • Conduct interactive discussions and encourage questions from students.
  4. Learners’ Activities (10 minutes)
    • Engage students in hands-on activities: a) Divide the class into pairs or small groups. b) Distribute objects of different weights to each group. c) Instruct students to estimate the weight of the objects and measure them using scales. d) Have students record the weights in grams and kilograms.
  5. Assessment (5 minutes)
    • Distribute worksheets or handouts with weight-related problems.
    • Instruct students to solve the problems using their knowledge of grams and kilograms.
    • Monitor students’ progress and provide assistance if needed.
  6. Evaluation Questions (10 minutes)
    • Ask the following questions to assess students’ understanding:
      1. What is the unit used to measure smaller objects?
      2. Which unit is used for measuring heavier objects?
      3. How many grams are there in 1 kilogram?
      4. Give an example of an object that would be measured in grams.
      5. Give an example of an object that would be measured in kilograms.
      6. How would you measure the weight of a small toy car?
      7. How would you measure the weight of a watermelon?
      8. Can you convert 500 grams to kilograms?
      9. Can you convert 2 kilograms to grams?
      10. Explain why it is important to use the correct unit of measurement when measuring weights.
  7. Conclusion (5 minutes)
    • Summarize the key points of the lesson.
    • Emphasize the importance of understanding and applying units of weight measurement in everyday life.
    • Encourage students to practice their skills by measuring weights at home and in different real-life scenarios.
  8. Homework (Optional)
    • Assign a few weight-related problems for students to solve independently.

Note: Adjust the duration of each activity according to the pace of the class and ensure active student participation throughout the lesson.

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