# 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. Addition of Numbers

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 **

Addition and Subtraction of Numbers

**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)andWeek 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 U2 5

+ 1 1

_____________________

3 6

_____________________

Solutions 2

T U3 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.

**ADDITION OF WHOLE NUMBERS **

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 U3 2 5

+ 4 6 1

___________

7 8 6

___________

Solution 2

**2 2 3 + 2 3 2**

H T U2 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 Examples1. 3 2 5 – 1 1 1

2. 5 2 5 – 3 2 5

Solution 1

3 2 5 – 1 1 1

H T U3 2 5

– 1 1 1

___________

2 1 1

___________

Solution 25 2 5 – 3 2 5

H T U5 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.