# Addition of 2 or 3 Digit Numbers using the Partial Sums Method (Primary 3)

MATHEMATICS

FIRST TERM

WEEK 9

PRIMARY 3

THEME – WHOLE NUMBERS

PREVIOUS LESSON –

TOPIC – ADDITION OF WHOLE 2 OR 3 DIGIT NUMBERS – PARTIAL SUMS METHOD

LEARNING AREA

1. Introductory Activities

2. Addition of 2 Digit Numbers

3. Addition of 3 Digit 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 –

add 2 or 3 digit numbers by partial sum method.

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

Teacher’s/Pupil’s Activities – Quick guide and assessment on addition of whole numbers with or without remainder –

Quick Assessment

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

ADDITION OF 2 DIGIT NUMBERS BY PARTIAL SUMS METHOD

Teacher’s/Pupil’s Activities – Guides the pupils to understand the concept of add 2 digit numbers by partial sums method.

Working Examples

1. 2 5 + 1 6

2. 3 8 + 2 7

Solution 1

2 5 + 1 6

2 5 = 20 + 5

+ 1 6 = 10 + 6

_________________________________

= 30 + 11

_________________________________

Partial Sums Method

3 0

+ 1 1

_________________________________

4 1

_________________________________

Therefore, 2 5 + 1 6 = 4 1

Solution 2

3 8 + 2 7

3 8 = 30 + 8

+ 2 7 = 20 + 7

_________________________________

= 50 + 15

_________________________________

Partial Sums Method

5 0

+ 1 5

_________________________________

6 5

_________________________________

Therefore, 3 8 + 2 7 =  6 5

LESSON EVALUATION/ASSIGNMENT

1. 5 9 and 3 4

2. 7 6 and 1 6

3. 7 9 and 4

LESSON TWO – ADDITION OF 3 DIGIT NUMBERS BY PARTIAL SUMS METHOD

Teacher’s/Pupil’s Activities – Guides the pupils to understand the concept of add 3 digit numbers by partial sums 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

_________________________________

Partial Sums Method

1 1

1 0 0

+ 7 0 0

_________________________________

8 1 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

_________________________________

Partial Sums Method

1 2

+ 1 2 0

+ 4 0 0

_________________________________

5 3 2

_________________________________

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

LESSON EVALUATION/ASSIGNMENT

1. 5 5 1 + 3 6 9

2. 3 9 5 + 2 0 7

3. 3 6 0 + 1 1 1

LESSON THREE – REVISION AND TEST OF ADDITION OF 2 AND 3 DIGIT NUMBERS BY PARTIAL SUMS METHOD 1

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. Guides pupils to add 2 or 3 digit numbers by partial sum method.

Pupil’s Activities – Add 2 or 3 digit numbers by partial sum method.

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 –

LESSON EVALUATION

Pupils to add 2 or 3 digit numbers by partial sum method.

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