Distributive Rule of Multiplication Over Addition and Subtraction (Primary 3)

MATHEMATICS

SECOND TERM  

WEEK 5

PRIMARY 3

THEME – BASIC OPERATIONS 

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

TOPIC – DISTRIBUTIVE RULE OF MULTIPLICATION OVER ADDITION AND SUBTRACTION 

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 expand using the distributive rule.

ENTRY BEHAVIOUR

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

1. counters like beads, sticks, etc.

2. 10 x 10 square charts

3. Multiplication table

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 1 – Identification of Open and Close Bracket ( ) Sign with Multiplication Addition and Subtraction Signs 

Introductory Questions

What sign is this, x, +, and —?

Expected Response

+, this is plus

—, this is minus

Identify the signs in the question,

5 x (3 + 2)

3 x (5 — 2)

Expect Response

We have multiplication, addition and Subtraction signs.

Teacher’s remark – What about this ( )? ( – this is called open bracket while ) – close bracket. ( ) is the same with { }. 

Pupil’s Activities 2 – Basic Multiplication, Addition and Subtraction 

Guide pupils solve,

1. 5 x (3 + 2)

= 5 x (5)

= 5 x 5

= 25

 

2. 3 x (5 — 2)

= 3 x (5 — 2)

= 3 x (3)

= 3 x 3

= 9

Pupil’s Activities 3 – Exercise/Take Home 

Simplify

1. 7 x (4 + 3)

2. (3 + 4) x 7

3. (8 — 5) x 4

4. 4 x (9 — 6)

LESSON TWO – DISTRIBUTIVE RULE OF MULTIPLICATION OVER ADDITION

Teacher’s/Pupil’s Activities 1 – Expand using Distributive Rule 

5 x (3 + 2)

= (5 x 3) + (5 x 2)                                                                 5 x (5)

= 15 + 10                                  compare                             5 x 5

= 25

(3 + 4) x 7

= (7 x 3) + (7 x 4)

= 21 + 28

= 49

Pupil’s Activities 2 – Exercise/Take Home 

Expand using Distributive Rule

1. (2 + 2) x 5

2. (5 + 1) x 6

3. 4 x (3 + 2)

4. 3 x (3 x 3)

LESSON THREE – DISTRIBUTIVE RULE OF MULTIPLICATION OVER SUBTRACTION 

Teacher’s/Pupil’s Activities 1 – Expand Using Distributive Rule 

3 x (5 — 2)

= (3 x 5) — (3 x 2)                                                               3 x (3)

= 15 — 6                                                                               3 x 3

= 9

(3 + 4) x 7

= (7 x 3) + (7 x 4)

= 21 + 28

= 49

Pupil’s Activities 2 – Exercise/Take Home 

Expand using Distributive Rule

1. (2 + 2) x 5

2. (5 + 1) x 6

3. 4 x (3 + 2)

4. 3 x (3 + 3)

LESSON THREE – DISTRIBUTIVE RULE OF MULTIPLICATION OVER SUBTRACTION 

Teacher’s/Pupil’s Activities 1 – Expand Using Distributive Rule 

3 x (5 — 2)

= (3 x 5) — (3 x 2)                                                               3 x (3)

= 15 — 6                                                                               3 x 3

= 9

(5 — 3) x 7

= (7 x 5) — (7 x 3)

= 35 — 21

= 14

Pupil’s Activities 2 – Exercise/Take Home 

Expand using Distributive Rule

1. (3 — 2) x 5

2. (5 — 1) x 6

3. 4 x (7 — 2)

4. 3 x (8 — 3)

LESSON FOUR – DISTRIBUTIVE RULE OF MULTIPLICATION OVER ADDITION AND SUBTRACTION 

Teacher’s/Pupil’s – More Questions

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 expand using distributive rule.

Pupil’s Activities – Follow the teacher’s guidelines.

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 expand using the distributive rule.