The Idea of Length.

Subject : Mathematics


Topic :The Idea of Length


Class : Primary 1


Term : Third Term


Week : Week 4


Instructional Materials :

Ruler, tape rule, hand measure, arm span

Previous Knowledge :

The pupils have been taught measuring tools

Behavioural Objectives :  At the end of the lesson, the pupils should be able to




Content :


Topic : Idea of Length


Content : Length is the act of knowing how long an objects is.

It is also the ability to know how wide an objects is



You can know the length of your school bag by measuring the longer side of it and also the shorter side of it.

You can know the length of the classroom door and how wide is it

You can know how long or wide your classroom desks and chairs are


Instrument used in measuring the length of objects are:


  1. Ruler

  2. Rope

  3. Measuring tape (used by the tailor)

  4. Your feet




Draw 2 bags

1 big bag and

another 1 beside it

Compare the length of the bags


  1. 🛍🛍🛍🛍🛍


  1. 🔨🔨


  1. 📜📜


  1. 📕📕


  1. 🖍🖍


  1. 📝✏




The topic is presented step by step


Step 1: The class teacher revises the previous topics


Step 2. He introduces the new topic


Step 3: The class teacher allows the pupils to give their own examples and he corrects them when the needs arise


Evaluation :

  1. Mention four objects that can be measured at home

  2. Mention four objects that can be measured in school


Conclusion :


The teacher gives a brief note on the topic and he goes round to mark


Assignment :

  1. Draw and measure your class teacher table
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