Comparing the length of objects for Primary 1

Class: Primary One
Term: Third Term
Week: 5
Age: 6 years
Duration: 45 minutes
Subject: Basic Science
Curriculum Theme: Science, Technology and Development
Focal competence: Using technology products to measure weight, length and time
Key competencies/values: Research and Problem Solving; Communication
Skills:

• Comparing length of objects and things using the words longer and shorter

Previous Lesson: Measuring Length, Weight and Time
Topic: Measuring Things: Length
Subject Matter: Comparing the length of objects

Specific Objectives

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

Cognitive Domain

• Compare the length of familiar objects.
• Use the words “longer” and “shorter” correctly when comparing objects.

Affective Domain

• Appreciate the importance of comparing lengths in everyday situations.

Psychomotor Domain

• Group familiar objects according to their length.

Reference Materials

The following resources were used in planning this lesson:

• 2025 Revised 9 Years Basic Education Curriculum
• Relevant State Unified Scheme of Work
• Basic Science for Primary 1, Pupil’s Book
• The HeadTeacher Scheme of work

Instructional Materials

The teacher will teach this lesson with the aid of:

• Objects of different lengths (e.g., pencils, rulers, erasers, books, sticks, straws)
• A ruler or tape rule (for demonstration)
• Chart showing pairs of objects with “longer” and “shorter” labels

Rationale for the Lesson

This lesson introduces pupils to the fundamental concept of length and how to compare objects based on their size. Understanding length comparison is a basic life skill that helps pupils describe their environment and make practical decisions, laying a foundation for more complex measurements in the future.

Prerequisite/Previous Knowledge

Pupils can identify various common objects in their environment and have a basic understanding of size differences (e.g., big/small).

Lesson Content/Board Summary

Measuring Things: Length

Meaning of Length

Length is how long something is from one end to the other. It tells us how far two points are from each other.

Comparing Long and Short Objects

We compare objects to see which one is longer or shorter.

1. Longer: An object is longer if it stretches further than another object.
2. Shorter: An object is shorter if it does not stretch as far as another object.

When comparing, we place the objects side by side, starting from the same point, to see which one extends more.

Measuring Length with Non-Standard Units

We can measure length using things we find around us, not just rulers. These are called non-standard units.

1. Examples of non-standard units: Hand span, footsteps, pencils, paper clips, erasers.
2. To measure, we place the unit (e.g., a pencil) end-to-end along the object and count how many units it takes.

Teaching Methods/Instructional Techniques

Discussion, Demonstration, Guided Practice, Question and Answer, Explanation, Observation, Practical Activity, Group Work

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Engaging/Activating Prior Knowledge

Teacher’s Activity: The teacher greets the pupils and asks them to look around the classroom and identify two objects that are different in size, like a long broom and a short duster. The teacher then asks, “Which one is longer? Which one is shorter?”

Pupils’ Activity: Pupils respond by pointing out objects and verbally stating which is longer or shorter based on their observation.

Learning Point: Introduction to length comparison

Step 2: Meaning of Length

Time: 7 minutes

Teaching Skill: Explanation/Demonstration

Teacher’s Activity: The teacher explains what length means using simple language, demonstrating with a pencil and a book. “Length tells us how long something is. Look at this pencil; it has a start and an end. The distance from the start to the end is its length.”

Pupils’ Activity: Pupils listen attentively and observe the teacher’s demonstration, pointing to the length of their own pencils.

Learning Point: Understanding of length

Step 3: Comparing Objects (Teacher Model)

Time: 8 minutes

Teaching Skill: Modelling/Demonstration

Teacher’s Activity: The teacher places two familiar objects (e.g., a long stick and a short stick) side by side on a table, ensuring they start from the same point. The teacher then clearly states, “This stick is longer than that stick,” and “That stick is shorter than this stick,” emphasizing the words “longer” and “shorter”. The teacher repeats with another pair of objects.

Pupils’ Activity: Pupils observe the teacher’s demonstration carefully and listen to the words “longer” and “shorter”.

Learning Point: Teacher models comparison

Step 4: Guided Practice in Comparing Lengths

Time: 7 minutes

Teaching Skill: Guided Practice/Questioning

Teacher’s Activity: The teacher distributes pairs of objects (e.g., two different pencils, two different erasers) to small groups or pairs of pupils. The teacher instructs them to compare their objects and tell each other which one is longer and which is shorter.

Pupils’ Activity: Pupils compare their objects, discuss with their partners, and use the words “longer” and “shorter” to describe them.

Learning Point: Pupils compare objects

Step 5: Measuring with Non-Standard Units

Time: 6 minutes

Teaching Skill: Practical Activity/Instruction

Teacher’s Activity: The teacher introduces the idea of measuring with non-standard units like a hand span or a small stick. The teacher demonstrates how to measure the length of a desk using their hand span, counting each span. “We can use our hands to measure how long things are!”

Pupils’ Activity: Pupils observe the teacher’s demonstration and try measuring their books or desks using their hand spans or small objects provided.

Learning Point: Non-standard length measurement

Step 6: Grouping Objects by Length

Time: 5 minutes

Teaching Skill: Application/Organisation

Teacher’s Activity: The teacher provides a collection of various objects of different lengths to groups of pupils. The teacher instructs them to sort and group the objects into “long objects” and “short objects” piles.

Pupils’ Activity: Pupils work in groups to sort and group the objects according to their length, placing them into designated piles.

Learning Point: Grouping by length

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. Show me two objects and tell me which one is longer.
2. Show me two objects and tell me which one is shorter.
3. What does “length” mean?
4. Can you group these objects into long and short piles?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Assessment of length comparison

Step 8: Note-Taking

Time: 4 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils to copy the essential Board Summary notes about the meaning of length and comparing objects into their notebooks.

Pupils’ Activity: Pupils copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 3 minutes

Teaching Skill: Reinforcement

Teacher’s Activity: The teacher briefly reminds pupils that they have learned to compare objects using “longer” and “shorter” and that length tells us how long something is. The teacher encourages them to practice comparing objects at home.

Pupils’ Activity: Pupils listen and acknowledge the summary of the lesson.

Learning Point: Consolidation of length concepts

Continuous Assessment/Further Study

Type: Homework

Instruction: Look around your home and find two pairs of objects. For each pair, draw the objects and write “longer” or “shorter” next to them to show which is which.

1. A spoon and a fork.
2. Your school bag and your pencil case.
3. Your bed and your pillow.

Lesson Keywords

• Length – How long something is from one end to the other.
• Longer – When one object stretches further than another.
• Shorter – When one object does not stretch as far as another.
• Compare – To look at two or more things to see how they are different or similar.

Differentiation

For pupils who are struggling, provide more one-on-one guidance during the comparison activities, using very distinct object lengths. For faster learners, challenge them to find three objects and arrange them from shortest to longest or vice versa, or to use more complex non-standard units for measurement.

Suggested Lesson Videos

For additional visual learning, search on YouTube for: comparing length for kids primary 1

Teacher Guide for Using This Lesson Plan

Begin the lesson by having a variety of objects of different lengths readily available for demonstration and pupil activities. Follow the teaching sequence by first explaining the concept of length, then demonstrating how to compare objects using “longer” and “shorter.” Encourage active participation through guided practice where pupils compare objects themselves. Pay close attention to pupils’ use of vocabulary and correct any misconceptions immediately. Pupils should copy the Board Summary notes into their notebooks after the main teaching points have been delivered and evaluated. Ensure a safe environment during practical activities, especially when handling objects. Check for understanding throughout the lesson by asking questions and observing their sorting and comparison skills. Provide extra support to weaker learners by simplifying instructions and offering more direct examples, while challenging faster learners with additional comparison tasks.