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# Addition of Whole Numbers with Exchanging or Remaining (Primary 3)

MATHEMATICS

FIRST TERM

WEEK 8

PRIMARY 3

THEME – WHOLE NUMBERS

PREVIOUS LESSON – Addition of Whole Numbers without Exchanging or Remaining (Primary 3)

TOPIC – ADDITION OF WHOLE NUMBERS

LEARNING AREA

1. Introductory Activities

2. Addition of Whole with Exchanging or Remaining – Expanded and Direct Methods

3. Word Problems on Addition of Whole 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. add 2-digit Whole numbers with exchanging or renaming.

2. add 3 – digit whole numbers with exchanging or remaining.

ENTRY BEHAVIOUR

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

Charts and flash cards, etc. Addition cards, Fraction card, Fraction board, Counters, charts, Abacus, etc.

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 – INTRODUCTORY ACTIVITIES

REVISION ON ADDITION OF 2 DIGIT WHOLE NUMBERS (10 minutes)

Flash the addition cards to the pupils and let them respond by giving correct answers to questions such as 8 + 5, 7 + 4, 6 + 5, etc. contained in addition cards.

Quick Guide and Evaluation on two digit numbers –

1. 2 5 + 1 6

2. 3 8 + 2 7

Solutions 1

2 5 + 1 6

2 5 = 20 + 5

+ 1 6 = 10 + 6

_________________________________

= 30 + 1 6

= 30 + 10 + 6

4 6 = 40 + 6

_________________________________

Therefore, 2 5 + 1 6 = 4 6

Solutions 2

3 8 + 2 7

3 8 = 30 + 8

+ 2 7 = 20 + 7

_________________________________

= 50 + 1 5

= 50 + 10 + 5

6 5 = 60 + 5

_________________________________

Therefore, 3 8 + 2 7 = 6 5

Be sure that the pupils arrange each digit of the numbers correctly. Allow simple counting because of individual difference.

Quick Assessment

1. 5 9 and 3 4

2. 7 6 and 1 6

ADDITION OF 3 DIGIT WHOLE NUMBERS (10 minutes)

Teacher’s/Pupil’s Activities – Guides the pupils to add 3 – digit numbers using expanded method.

Working Examples

1. 3 4 5 + 4 6 6

2. 2 9 3 + 2 3 9

Solution 1 – Expanded Method

3 4 5 + 4 6 6

3 4 5 = 300 + 40 + 5

+ 4 6 6 = 400 + 60 + 6

_________________________________

= 700 + 100 + 11

= 700 + 100 + 10 + 1

= 700 + (100 + 10) + 1

8 1 1 = 800 + 10 + 1

_________________________________

Therefore, 3 4 5 + 4 6 6 = 8 1 1

Solution 2 – Expanded Method

2 9 3 + 2 3 9

2 9 3 = 200 + 90 + 3

+ 2 3 9 = 200 + 30 + 9

_________________________________

= 400 + 120 + 12

= 400 + (100 + 20) + (10 + 2)

5 3 2 = 500 + 30 + 2

_________________________________

Therefore, 2 9 3 + 2 3 9 = 5 3 2

LESSON EVALUATION/ASSIGNMENT/MARKING/CORRECTION (20 minutes)

1. 5 5 1 + 3 6 9

2. 3 9 5 + 2 0 7

3. 3 6 6 + 1 6 6

LESSON TWO – ADDITION OF WHOLE NUMBERS – DIRECT METHOD

Teacher’s/Pupil’s Activities – Guides the pupils to add 3 – digit numbers using direct method.

Working Examples

1. 3 4 5 + 4 6 6

2. 2 9 3 + 2 3 9

Solution 1 – Expanded Method

3 4 5 + 4 6 6

3¹ 4¹ 5

+ 4  6  6

_________________________________

8  1  1

_________________________________

Therefore, 3 4 5 + 4 6 6 = 8 1 1

Solution 2 – Expanded Method

2 9 3 + 2 3 9

2¹ 9¹ 3

+ 2  3  9

_________________________________

5  3  2

_________________________________

Therefore, 2 9 3 + 2 3 9 = 5 3 2

LESSON EVALUATION/ASSIGNMENT/MARKING/CORRECTION (20 minutes)

1. 5 3 1 + 3 6 0

2. 3 4 5 + 2 0 4

3. 3 6 0 + 1 1 1

LESSON THREE – WORD PROBLEMS INVOLVING ADDITION OF WHOLE NUMBERS

Teacher’s/Pupil’s Activities – Gives the pupils simple quick assessment on word problems –

Opeyemi carried 36 maize seeds, Segun carried 28 maize seeds. How many maize seeds did they carry altogether?

Solution

Opeyemi – 3 7

Segun     – 2 8

3¹ 7

+ 2  8

_________________________________

6  5

_________________________________

They both carried 65 yams.

Further Working Examples

Michael carried 312 maize seeds, Stephen carried 231 maize seeds. How many maize seeds did they carry altogether?

Solution

Opeyemi – 3 5 8

Segun     – 2 6 3

Direct Method

3¹ 5¹ 8

+ 2  6  3

_________________________________

6  2  1

_________________________________

They both carried 621 yams.

LESSON EVALUATION/ASSIGNMENT

1. Nathaniel bought a carton of salt for 356 and of sugar for 317. How much did he spend altogether?

2. There are 445 girls and 487 boys in Award International Nursery and Primary School. How many pupils are there altogether?

3. Mr. Segun had 495 yams. He bought 385 more yams. How many yams does he have altogether?

For more questions on word problems – see New Methods Mathematics Book 3

WORKBOOK – WEEKLY ASSESSMENT

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. Teacher’s/Pupil’s Activities – Guides pupils on oral additions using addition cards. Flash the addition cards to the pupils and let them respond by giving correct answers to questions such as 8 — 5, 7 — 4, 6 — 5, etc. contained in addition cards.

3. Guides pupils to add two numbers with 3 digits that involves exchanging or renaming.

Pupil’s Activities – Add two numbers with 3 digits that involve renaming or exchanging.

4. Guides pupils in solving some addition problems on the board.

Pupil’s Activities – Solving some addition problems on the board.

5. Guides pupils on the use of abacus in adding numbers.

Pupil’s Activities – Use abacus to perform addition of two numbers without 3- digits.

Workbook – Weekly Assessment

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. add 2 – digit numbers with exchanging and renaming.

2. add two given 3 digits numbers with exchanging or remaining.