Conversion of Centimeters to Meters and Vice Versa For Primary 1

Subject: Mathematics

Class: Primary 1

Topic: Conversion of Centimeters to Meters and Vice Versa

Week: 3

Term: Third Term

Duration: 40 minutes

A. Lesson Objectives

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

1. Understand the relationship between centimeters and meters.

2. Convert from centimeters to meters and vice versa.

3. Recognize the symbols for centimeters (cm) and meters (m).

4. Use simple real-life examples to explain the conversion process.

B. Instructional Materials

• A ruler marked in centimeters and meters

• A measuring tape

• Chart or flashcards with cm and m symbols

• Objects with known measurements in centimeters and meters (e.g., a pencil, a book)

• Whiteboard and markers

• Pencils and notebooks

C. Lesson Content

1. Introduction to Length Measurement

• Centimeter (cm) is a unit of length used to measure small objects or short distances. It is commonly used in everyday life for things like measuring the length of a pencil, book, or table.

• Meter (m) is also a unit of length, but it is used to measure larger objects or longer distances, such as the length of a room or a swimming pool.

1 meter = 100 centimeters

This means that 1 meter is equal to 100 centimeters.

2. Converting Centimeters to Meters

To convert from centimeters (cm) to meters (m):

• We divide the number of centimeters by 100.

Example:

• Convert 250 cm to meters:
  250cm=100/250​=2.5m

So, 250 cm is equal to 2.5 meters.

3. Converting Meters to Centimeters

To convert from meters (m) to centimeters (cm):

• We multiply the number of meters by 100.

Example:

• Convert 3 meters to centimeters:
  3m=3×100=300cm

So, 3 meters is equal to 300 centimeters.

4. Real-Life Examples

• Example 1: If a pencil is 15 centimeters long, how many meters is it?

  • Answer: 15cm =15/100 ​=0.15m

• Example 2: A classroom is 5 meters long. How many centimeters is that?

  • Answer: 5m=5×100=500cm

5. Symbols and Units

• cm = centimeters

• m = meters

D. Class Activities

Activity 1: Conversion Practice

• Teacher will provide the class with different objects (e.g., pencil, notebook, table) and their measurements in either centimeters or meters.

• Pupils will be asked to convert these measurements to the other unit (centimeters to meters and meters to centimeters).

Example Questions:

1. Convert 150 cm to meters.

2. Convert 2 meters to centimeters.

3. How many meters are in 300 cm?

Activity 2: Measuring Objects

• Pupils will use a ruler to measure objects in centimeters and convert them to meters.

• Pupils can also use a measuring tape to measure larger objects and convert from meters to centimeters.

E. Evaluation (Assessment)

1. Convert 120 cm to meters.

2. Convert 4 meters to centimeters.

3. How many centimeters are in 2.5 meters?

4. How many meters are in 500 cm?

F. Assignment

1. Measure the length of 3 objects at home (e.g., a pencil, book, chair) in centimeters.

2. Convert their measurements to meters.

3. Write down the measurements in both centimeters and meters.

G. Conclusion

• Review the concept of centimeters and meters and how to convert between them.

• Ask pupils to share their examples and discuss the correct conversion.

• Emphasize that understanding these conversions helps in measuring both small and large objects.