# Common Multiples of Numbers Up to 9 and LCM of Numbers (Primary 4)

Last Updated on July 15, 2020 by Alabi M. S.

MATHEMATICS

SECOND TERM

WEEK 4

PRIMARY 4

THEME – NUMBERS AND NUMERATION

PREVIOUS LESSON – Second Term Scheme of Work and Plan Lesson Notes for MATHEMATICS Week 1 to Week 12 Primary Schools

TOPIC – COMMON MULTIPLES AND LEAST COMMON MULTIPLE (LCM)

PERFORMANCE OBJECTIVES

By the end of the lesson, the pupils should have attained the following objectives (cognitive, affective and psychomotor) and should be able to –

1. write out multiples of Numbers up to 9

2. identify common multiples in numbers.

3. find the LCM of 2-digit whole numbers;

4. solve quantitative aptitude problem on LCM.

ENTRY BEHAVIOUR

Multiplication table up to 12 x 12.

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of Charts of factors of numbers.

METHOD OF TEACHING – Choose a suitable and appropriate methods for the lessons.

Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons.

REFERENCE MATERIALS

1. Scheme of Work

2. 9 – Years Basic Education Curriculum

3. Course Book

4. All Relevant Material

5. Online Information

CONTENT OF THE LESSON

## LESSON ONE – INTRODUCTION

Pupil’s Activities – Multiples of Numbers

Sample

A. 1 = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

B. 2 = 2, 4, 6. 8, 10, 12, 14, 16, 18, 20

Find the multiples of the following numbers up to 10 times,

1. 3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

2. 4 = 4, 8, 12, 16, 20, 24, 28, 32, 36, 40

Teacher’s activities – Assist the pupils where necessary.

Teacher’s remark – We can use repeated addition or multiplication to find the multiples.

Multiples of 3 = 3, 3 + 3 = 6, 6 + 3 = 9, 9 + 3 = 12, etc.

Pupil’s Activities 2 – Exercises/Take Home

Write down the first ten multiples of

1. Multiples of 5 =

2. Multiples of 6 =

3. Multiples of 7 =

4. Multiples of 8 =

5. Multiples of 9 =

## LESSON TWO – COMMON MULTIPLES

Pupil’s Activities 1 – Identification of Common Multiples

Sample

A. 1 = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

B. 2 = 2, 4, 6. 8, 10, 12, 14, 16, 18, 20

Common multiples are 2, 4, 8 and 10.

Find the common Multiples of,

1. 3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

4 = 4, 8, 12, 16, 20, 24, 28, 32, 36, 40

Common Multiples are 12 and 24

2. 5 = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.

10 = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100

Common Multiples are 10, 20, 30, 40 and 50.

Teacher’s activities – Guides pupils where necessary.

Pupil’s Activities 2 – Exercises/Take Home

Find the Multiple and Common Multiples of

1. 2 =

5 =

Common Multiples =

2. 3 =

9 =

Common Multiples =

3. 4 =

8 =

Common Multiples =

4. 3 =

8 =

Common Multiples =

## LESSON THREE – LEAST COMMON MULTIPLES

Pupil’s Activities 1 – USING MULTIPLE METHOD

Teacher’s Activities – Find the multiple of 5 and 10.

Pupil’s Response,

5 = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.

10 = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100

Teacher’s Activities – Find the common multiples of 5 and 10.

Pupil’s Response,

Common Multiples are 10, 20, 30, 40 and 50

Teacher’s Activities – What is the smallest (least) of 10, 20, 30, 40 and 50?

Pupil’s Response – 10 is the smallest number.

Teacher’s remark – 10 is the LCM of 5 and 10.

Pupil’s Activities 2 – Exercises/Assignment

Find the LCM of

1. 2 and 5

2. 3 and 9

3. 4 and 8

4. 3 and 8

## LESSON FOUR – LEAST COMMON MULTIPLES

Teacher’s/Pupil’s Activities 1 – Using Factor Methods

Guides pupils to find the LCM of 3 and 4.

LCM of 3 and 4 is 2 x 2 x 3 = 12

Pupil’s Activities 2 – Find the LCM of 6 and 8.

Pupil’s Activities 3 – Exercises/Assignment

Find the LCM of

1. 2 and 5

2. 3 and 9

3. 4 and 8

4. 3 and 8

PRESENTATION

To deliver the lesson, the teacher adopts the following steps:

1. To introduce the lesson, the teacher revises the previous lesson. Based on this, he/she asks the pupils some questions;

2. Guides pupils to find LCM of two digit number.

Pupil’s Activities – Find LCM by use of factor method

CONCLUSION

• To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.

LESSON EVALUATION

Pupils to:

1. obtain LCM of two numbers by identifying the lowest of the common multiples.

2. find the LCM by factor method.

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