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

Addition of Whole Numbers

 

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) 

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.

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 

Add the following –

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 

Answer the following questions –

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 

• First Term Workbook – Weekly Assessment for Mathematics (Primary 3)

 

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.

• Next Lesson – Addition of 2 or 3 Digit Numbers using the Partial Sums Method (Primary 3)

 

LESSON EVALUATION 

Pupils to:

1. add 2 – digit numbers with exchanging and renaming.

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