# Mixed Operations – Addition and Subtraction of 3 – Digit Whole Numbers (Primary 2)

MATHEMATICS

FIRST TERM

WEEK 11

PRIMARY 2

THEME – WHOLE NUMBERS

PREVIOUS LESSON – Subtraction of Whole Numbers without Exchanging or Remaining (Primary 2)

TOPIC – ADDITION AND SUBTRACTION OF WHOLE NUMBERS

LEARNING AREA

1. Introductory Activities

2. Subtraction of 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 3 – digit whole numbers without exchanging or remaining.

2. subtract 3 – digit whole numbers without exchanging or remaining.

ENTRY BEHAVIOUR

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

Charts and flash cards, etc. Subtraction cards, 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 – Mathematics (Primary 2)

CONTENT OF THE LESSON

LESSON ONE – INTRODUCTORY ACTIVITIES

Teacher’s/Pupil’s Activities – Revises addition and subtraction of 2 – digit numbers – Week 9 (Addition) and Week 10 (Subtraction), revises addition and subtraction of 2 – digit numbers.

Quick Guide and Evaluation on two digit numbers –

1. 2 5 + 1 1

2. 3 6 – 2 2

Solutions 1

T U

2 5

+ 1 1

_____________________

3 6

_____________________

Solutions 2

T U

3 6

– 2 2

_______________________________

1 4

_______________________________

Therefore, 3 6 – 2 2 = 1 4

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

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

Working Examples

1. 3 2 5 + 4 6 1

2. 2 2 3 + 2 3 2

Solution 1

3 2 5 + 4 6 1

H T U

3 2 5

+ 4 6 1

___________

7 8 6

___________

Solution 2

2 2 3 + 2 3 2

H T U

2 2 3

+ 2 3 2

___________

4 5 5

___________

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 TWO – SUBTRACTION OF WHOLE NUMBERS

Teacher’s/Pupil’s Activities – Guides the pupils to subtract 3 – digit numbers.

Working Examples

1. 3 2 5 – 1 1 1

2. 5 2 5 – 3 2 5

Solution 1

3 2 5 – 1 1 1

H T U

3 2 5

– 1 1 1

___________

2 1 1

___________

Solution 2

5 2 5 – 3 2 5

H T U

5 2 5

+ 3 2 5

___________

2 0 0

___________

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

1. 5 3 1 – 3 2 0

2. 3 4 5 – 2 0 4

3. 3 6 5 – 1 1 1

LESSON THREE – REVISION ON ADDITION AND SUBTRACTION I FOUR – 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. Guides pupils to add and subtract two numbers without 3 – digits that involves exchanging or renaming.

Pupil’s Activities – Add and subtract two numbers without 3 – digits that involve renaming or exchanging.

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 – Revision and First Term Examination Basic 2

LESSON EVALUATION

Pupils to:

1. add and subtract 2 – digit numbers without exchanging and renaming.

2. add and subtract two given 3 – digits numbers without exchanging.

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