# Multiplication of Whole Numbers by 2 Digit Number not Exceeding 50 (Primary 4)

Last Updated on July 16, 2020 by Alabi M. S.

**MATHEMATICS **

**SECOND TERM**** **

**WEEK 1**

**PRIMARY 4**

**THEME – BASIC OPERATIONS **

** PREVIOUS LESSON – First Term Examination Links For Primary Schools**

**TOPIC – MULTIPLICATION OF WHOLE NUMBERS BY 2 DIGIT NUMBERS NOT EXCEEDING 50**

**LEARNING AREA**

1. Multiplication of Whole Numbers

2. Multiplication of Whole by Decimal Numbers vice versa

3. Multiplication of Decimal Numbers

**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. multiply whole numbers by 2-digit numbers not exceeding 50.

2. solves quantitative aptitude problems involving multiplication of whole numbers by 2-digit numbers.

3. multiply decimal numbers by 2-digit numbers.

4. solve quantitative aptitude problems involving multiplication of decimal numbers by 2-digit numbers.

**ENTRY BEHAVIOUR **

Multiplication table

**INSTRUCTIONAL MATERIALS**

The teacher will teach the lesson with the aid of:

1. Flash cards.

2. Multiplication charts.

3. Quantitative aptitude chart.

**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

**Relevant Links – ****Useful and Quick Links for Second Term Plan Lesson Notes All Subjects Primary 4, Primary 5 and Primary 6**

**CONTENT OF THE LESSON **

**LESSON 1 – INTRODUCTION **

*Copy and Complete the Multiplication Table *

*Copy and Complete the Multiplication Table*

**MULTIPLICATION TABLE**

**Teacher’s Activities – G****uide the pupils to commit to memory their multiplication tables. Morning drills and daily mental tests would help. At this stage pupils must learn each multiplication table up to 12 times 12.**

**Instructions – **

1. To find 6 x 4, look along the row with the first number 6.

2. Then move along the column until you get to 4.

3. The row and column meet at 24.

4. Therefore, 6 x 4 = 24.

**LESSON 2 – MULTIPLICATION OF WHOLE NUMBERS **

**Pupil’s Activities 1 – ****Using the multiplication table, what is **

1. 2 x 3

2. 3 x 8

3. 5 x 4

**Teacher’s/Pupil’s Activities 2 – Guide the pupils to find the product of **

**Instructions** –

Step 1: Multiply the digit 5 by the unit number 3. Thus 5 x 3 = 15

Step 2: Write down the 5 units and carry 1 ten over to the tens column.

Step 3: Now multiply the digit 1 by 3 in the tens column.

Step 4: Add the 1 ten to your answer.

**Teacher’s/Pupil’s Activities 3 – Guides the pupils find the products of **

## 2. 3 6 x 7, follow the example 1.

Pupil’s Activities – Class exercises/Assignments

Find the products of

(1) 47 x 23

(2) 23 x 47

**LESSON 3 – MULTIPLICATION OF DECIMALS NUMBERS**

**Teacher’s Activities 1 – Given Instructions – **

Step 1: Multiply the digits without the decimal point.

Step 2: Count the number of digits after the decimal point from the right to the left.

**Teacher’s/Pupil’s Activities 2 – Guides the pupils find the products of 4.7 x 2.3**

## Step 1

### Step 2

## 4.7 – – – – 1 digit after the decimal point

## x 2.3 – – – – 1 digit after the decimal point

## There are 2 digits altogether.

## Since 47 x 23 = 1081

## Therefore, 4.7 x 2.3 = 10.81

**Follow the same procedure in next activities. **

Pupil’s Activities – Class exercises/Assignments

Find the product of

(1) 2.3 x 4.7

(2) 4.7 x 7.4

## LESSON 4 – MULTIPLICATION OF WHOLE NUMBERS BY DECIMAL NUMBERS AND VICE VERSA

**Teacher’s/Pupil’s Activities 1 – Multiplication of Whole Numbers by Decimal Numbers **

Find the product of 47 x 2.3.

## Step 1

## Step 2

## 47 – – – – 0, no decimal

## 2.3 – – – 1 digit after the decimal point.

There is 1 digit altogether.

## Since 4 7 x 2 3 = 1 0 8 1,

## Therefore 47 x 2.3 = 108.1

Follow the procedure for the next activities.

**Pupil’s Activities – Class Exercises/Assignments **

Find the products of

(1) 2.9 x 43

(2) 43 x 2.9

## LESSON 5 – QUANTITATIVE REASONING

**As stated in their quantitative book. **

**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 revise multiplication of whole numbers.

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

3. Guides pupils to carry out multiplication of whole numbers in 2-digit numbers e.g. 40 × 12.

Pupil’s Activities – Carry out multiplication of whole numbers by 2-digit numbers.

4. Guide pupils to solving quantitative aptitude problems on multiplication of whole numbers with 2-digit numbers.

Pupils Activities – Solves quantitative aptitude problems involving multiplication of whole numbers by 2-digit numbers not exceeding 50.

5. Guides pupils to solve multiplication of decimal numbers by 2-digit numbers.

Pupil’s Activities – Solve problems on multiplication of decimal number with 2-digit number.

6. Guides pupils to solve quantitative aptitude problems involving multiplication of decimal numbers by 2-digit whole numbers.

Pupil’s Activities – Solve series of quantitative aptitude problems involving multiplication of decimal numbers with 2-digit whole numbers.

**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 –
**Square and Square Root One or Two Digits (Primary 4)**

**LESSON EVALUATION **

**Pupils to:**

1. multiply whole numbers by 2-digit numbers not exceeding 50.

2. solve quantitative aptitude problems involving multiplication of whole numbers by 2-digit numbers not exceeding 50.

3. multiply decimals by 2-digit numbers.

4. solve quantitative aptitude problems involving multiplication of decimal numbers by 2-digit numbers.