Mathematics - Primary 5

Term: 3^rd Term

Week 4
Class: Primary 5
Age: 10 years
Duration: 40 minutes of 5 periods
Date:
Subject: Mathematics
Topic: Angles

SPECIFIC OBJECTIVES:

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

Explain angles as a space between two lines that meet.
Mention and identify types of angles (acute, right, obtuse, straight, reflex) with examples in their environment.
Measure angles in degrees using a protractor.
Identify and differentiate corresponding, alternate, and vertically opposite angles using parallel and transversal lines.
Solve real-life problems involving angles.
Solve quantitative aptitude problems on angles.

INSTRUCTIONAL TECHNIQUES:

Demonstration
Guided discovery
Use of real-life examples
Group work
Interactive discussion
Hands-on activity with protractors

INSTRUCTIONAL MATERIALS:

Chart showing different types of angles
Protractor and ruler
Whiteboard and marker
Flashcards with angle diagrams
Straws or sticks for creating angles
Real-life pictures showing road intersections, corners of books, clock faces
Worksheet for exercises

INSTRUCTIONAL PROCEDURES

PERIOD 1 and 2

PRESENTATION

Step	Teacher’s Activity	Pupil’s Activity
STEP 1 – INTRODUCTION	Introduces angles using real-life examples like corners of doors, clock hands, scissors, and road signs. Explains that an angle is the space between two lines that meet at a point (vertex).	Pupils observe and mention examples of angles they’ve seen around.
STEP 2 – EXPLANATION	Discusses different types of angles: acute (< 90°), right (90°), obtuse (> 90° but < 180°), straight (180°), and reflex (>180°). Shows charts and asks pupils to identify each.	Pupils listen, observe the chart, and identify types of angles.
STEP 3 - DEMONSTRATION	Demonstrates how to identify types of angles from flashcards and real-life pictures.	Pupils participate by identifying angle types from the flashcards.
STEP 4 - NOTE TAKING	Writes definitions and examples of types of angles on the board.	Pupils copy notes and ask questions.

NOTE (On the Board):

Definition of an Angle:

An angle is the space between two lines that meet at a point.
The meeting point is called the vertex.

Types of Angles:

Acute Angle: Less than 90° (e.g., corners of a paper fold)
Right Angle: Exactly 90° (e.g., corners of a book)
Obtuse Angle: Greater than 90° but less than 180°
Straight Angle: Exactly 180°
Reflex Angle: Greater than 180°

Exercise:

Draw and label the 5 types of angles.
Identify real-life objects that show each type.

EVALUATION:

Ask pupils to identify types of angles in classroom objects.
Label angles from flashcards.

CLASSWORK:

Match angles to their correct names.
Identify angles in pictures and label them.

ASSIGNMENT:

Go home and find 5 examples of angles in your environment and write their type.

CONCLUSION:
The teacher commends pupils and reminds them to always look for examples of angles around them.

PERIOD 3 and 4

PRESENTATION

Step	Teacher’s Activity	Pupil’s Activity
STEP 1 – INTRODUCTION	Recaps previous lesson on types of angles. Introduces measurement of angles using protractors.	Pupils respond to questions and get ready with rulers and protractors.
STEP 2 – EXPLANATION	Demonstrates how to use a protractor to measure angles. Shows where to place the midpoint and how to read measurements.	Pupils watch carefully and ask questions.
STEP 3 - DEMONSTRATION	Measures various angles on the board using a protractor and asks pupils to do the same on paper.	Pupils practice measuring angles using their protractors.
STEP 4 - NOTE TAKING	Gives notes on measuring angles and how to use a protractor properly.	Pupils take notes and complete short measurement exercises.

NOTE (On the Board):

Measuring Angles:

Place the midpoint of the protractor on the vertex.
Align one line with the zero mark.
Read the degree where the second line falls.

Example:

Measure ∠ABC = 120°

Exercise:

Measure the following angles: ∠XYZ, ∠DEF, ∠LMN (drawn on the board).

EVALUATION:

Pupils measure angles using protractors.
Answer oral questions.

CLASSWORK:

Measure and record angles drawn on worksheets.

ASSIGNMENT:

Draw 5 angles and measure them accurately.

CONCLUSION:
Pupils are praised and encouraged to continue practicing with their protractors.

PERIOD 5

PRESENTATION

Step	Teacher’s Activity	Pupil’s Activity
STEP 1 – INTRODUCTION	Introduces parallel and transversal lines using board diagrams.	Pupils observe the diagrams.
STEP 2 – EXPLANATION	Explains and shows Corresponding, Alternate, and Vertically Opposite angles. Uses charts and diagrams.	Pupils ask questions and label angles with the teacher.
STEP 3 - DEMONSTRATION	Draws lines and angles on the board. Pupils identify angles formed. Uses real-life scenarios like road junctions.	Pupils come out to the board to identify and name angles.
STEP 4 - NOTE TAKING	Writes definitions and examples of the three angle types.	Pupils take notes.

NOTE (On the Board):

Angles from Parallel and Transversal Lines:

Corresponding Angles: Same position (top-top or bottom-bottom)
Alternate Angles: Opposite sides of the transversal
Vertically Opposite Angles: Formed when two lines cross

Example:
In the diagram with two parallel lines and one transversal:

∠a = ∠e (Corresponding)
∠b = ∠f (Alternate)
∠c = ∠g (Vertically Opposite)

Exercise:

Identify the corresponding, alternate, and vertically opposite angles in given diagrams.

EVALUATION:

Pupils solve problems identifying angle relationships.

CLASSWORK:

Answer questions on corresponding, alternate, and vertically opposite angles.

ASSIGNMENT:

Look at a street with crossing lines or drawings in a textbook and label all the angles formed.

CONCLUSION:
Teacher commends pupils for identifying angle relationships and encourages daily observation of angles in their environment.

SUMMARY OF LESSON:

This week, pupils learned about angles, including types, how to measure them, and how to identify relationships between angles using parallel and transversal lines. They used real-life objects and measuring tools like protractors to reinforce their understanding and practiced both theoretical and practical angle-related problems.

Mathematics - Primary 5 - Angles