Conversion of Units of Length


Lesson Planning of Conversion of Units of Length (Meters into Centimetres)

Subject Mathematics

Grade 4th

Students` Learning Outcomes

  • Convert meters into centimetres and vice versa.

Information for Teachers

  • A centimeter is a unit of length which is denoted as cm.
  • Cent means 100 therefore, 1 m = 100 cm.
  • Multiply the meters with 100 to convert them in centimetres, so, cm = m x 100.
  • Divide the centimetres with 100 to get meters, so, as; m = cm ÷ 100
  • Centimeter is used to measure small lengths.
  • A centimeter is approximately the width of the fingernail of an adult person.
  • Centipede is called by this name because it has 100 legs.
  • During this lesson the teacher should consult with textbook at each level where required.

Material / Resources

Writing board, chalk/marker, duster, measuring tape, scale, textbook


  • Write ‘meter and centimeter’ on the board and ask the students to share, whatever they know about these units.
  • Ask the students have you seen your scale, there are two measuring units on it i.e. inches and centimetres.
  • Tell them that today we will learn how to convert meters into centimetres and centimetres into meters.



Activity 1

  • Tell the students that we use meters to measure relatively short lengths as compare to kilometres. Normally we use measuring tape and meter rod to measure such sort of lengths.
  • Tell them that 1 m = 100 cm
  • Take an example of teacher`s table and tell them about the short length conversions.
  • Measure the length of the table and tell the students it is 2 meters long.
  • Now we will convert the length of table into centimetres.
  • To convert meters into centimetres simply multiply meters with 100, as;
  • 1 m = 100 cm
  • length of table = 2 cm
  • cm = m x 100
  • length of table in cm = 2 m x 100 = 200 cm



Activity 2

Conversion from centimetres to meters.

  • Ask a student to measure length of classroom window in centimetres and write it on the writing board so it can be converted into meters.
  • Suppose student tells you that length of window is 300 cm.
  • Teach the students with the help of board.
  • m = cm ÷ 100
  • length of window = 300 cm
  • length of the window into meters,  3 meters = 300 ÷ meters
  • Write the following questions and call various students to fill the blanks, as;


Activity 3

  • Tell the students that now we will talk about the meters and centimetres of decimal number.
  • Ask them, do they remember that they have adopted which method to correct the meters and kilometres into each other in the previous lesson?
  • Encourage them on the correct answers.
  • Tell them that in decimal numbers to correct the meters into centimetres the decimal point is moved to places to the right, as;
  • 2.5 m = 250.0 or 250 cm.
  • Tell them further that in decimal numbers to convert the centimetres into meters the decimal point is moved two places to the left, as;


Sum up / Conclusion

  • 1 m = 100 cm
  • Multiply the meters with 100 to convert into centimetres, as; cm = m x 100
  • To convert centimetres into meters we divide the centimetres with 100, as; m = cm ÷ 100.
  • To convert the meters into centimetres in the decimal numbers move the decimal point to two places on the right.
  • To convert the meters into centimetres in the decimal numbers move the decimal point to two places on the left.


  • Complete the following table.
  • Give some questions to solve from the text book.

Follow up

  • The length of Sarah’s scarf is 1.5 m. how much is the length of scarf in centimetres?
  • Ali has a 4 m long rope. He wants to divide it into three equal parts. What will be the length of each part in centimetres?
  • My sister`s height is 156 cm. how any meters tall is she?
  • Fahad has two bundles of ribbons. The length of purple ribbon is 3.2 m and the length of pink ribbon is 708 m. what is the total length of both the ribbons in centimetres?

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