# 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, 9,10B. 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, 304 = 4, 8,

12, 16, 20,24, 28, 32, 36, 40Common 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, 100Common 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.

- Next Lesson –
**Second Term Scheme of Work and Plan Lesson Notes for MATHEMATICS Week 1 to Week 12 Primary Schools**

**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.