Download the Lessonotes Mobile Liberia app for faster lesson access on Android and iPhone.
Subject: Mathematics
Semester: 1
Period: 1
Week: 1
School Name:
Teacher’s Name:
Subject: Mathematics
Grade Level: Grade 1
Date: Week 1
Lesson Duration: 45 minutes
Week & Period: Week 1, Period 1
Topic: Introduction to Sets
Sub-topic: Definition of Set and Representation
Learning Objectives
By the end of the lesson, students should be able to:
Define a set
Identify examples of sets in everyday life
Represent sets using listing method, description method, and set-builder notation
Previous Knowledge
Students already know:
How to name common objects around them
How to count up to 10
Instructional Materials
Mathematics textbook for Grade 1
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
Teacher greets students and asks them to name things they see in the classroom (e.g., chairs, books, pencils). The teacher then asks: “Can we group these things?” to lead into the concept of sets.
B – Building Knowledge (Main Lesson Body)
Time: 25–30 minutes
Definition: A set is a collection of objects or things. The things in a set are called members or elements.
Examples of sets in daily life:
Set of boys in the class
Set of girls in the class
Set of chairs in the room
Set of books in a school bag
Ways to represent sets:
- Listing Method: Write out all the elements inside curly brackets.
Example: Set of vowels = {a, e, i, o, u} - Description Method: Describe the members in words.
Example: The set of all vowels in the English alphabet - Set-builder Notation: Use a rule to describe the elements.
Example: {x | x is a vowel in the English alphabet}
Learners’ Activities (Expanded):
Students mention and group items in the class into sets (e.g., set of pencils, set of shoes).
Students form physical groups: set of boys, set of girls.
Each group writes their set using the three methods above.
Assessment Checks:
Teacher asks students to list the elements of given sets
Teacher asks learners to identify the type of representation used
Teacher gives an example and asks students to say if it is a set or not
Notes (Expanded & Detailed):
Sets must have well-defined items
Order of elements in a set does not matter
Each element is listed once, no repetition
C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Summary: A set is a collection of things. We can show a set by listing, describing, or using a rule. Examples are all around us in daily life.
Evaluation Method (Expanded):
Exit slip/quiz: Learners answer the question: “What is a set? Give one example.”
Teacher will collect slips and provide oral feedback.
Assignment (Expanded):
Look around your home and write 2 examples of sets you can find (e.g., set of plates, set of socks).
Follow-up Activity:
Next lesson will focus on the members (elements) of a set and how to count them.
Differentiation / Inclusive Strategies
Pair learners who struggle with reading with peers who can help. Use physical objects for learners who benefit from tactile learning.
Teacher’s Reflection (After Class)
What worked well? ___________________________________________
What needs improvement? ____________________________________
Students’ engagement level: ☑ High ☑ Medium ☑ Low