# Addition of Whole Numbers without Exchanging or Remaining (Primary 2)

MATHEMATICS

FIRST TERM

WEEK 9

PRIMARY 2

THEME – WHOLE NUMBERS

PREVIOUS LESSON – Fractions – ¾ of a given Collection of Objects (Primary 2)

TOPIC – ADDITION OF WHOLE NUMBERS

LEARNING AREA

1. Introductory Activities

2. Addition of Whole without Exchanging or Remaining

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 – digit numbers without exchanging or renaming.

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 – Revision on expansion of whole numbers –

There are 10 symbols of numbers where other numbers are formed by adding one digit to another or repeating each digit.

These numbers are – 1   2   3   4   5   6   7   8   9   as well as 0 and they are all called UNIT numbers.

From the flash card numbers, asks three pupils to pick a digit each to form a number and read loudly.

Assume the number formed is

## 2    5

Guided instructions –

1. Asks them to state the place values of each digit of the number.

• 5 Units
• 2 Tens

2. Discuss with the pupils what each value stands for –

• Unit                       – 1
• Ten                        – 10

3. Leads them to expand 2 5 –

• 5 x 1             = 5
• 2 x 10          = 20

That’s, 2 5 = 20 + 5

4. Guides the pupils to do quick expansion.

For example,

• 2 6 = 20 + 6
• 5 9 = 50 + 9
• 1 1 = 10 + 1
• 3 0 = 30 + 0

LESSON EVALUATION/ASSIGNMENT

Copy and complete each of the following.

1. 5 1 = _______ + _______

2. 1 6 = _______ + _______

3. 9 9 = _______ + _______

4. 1 9 = _______ + _______

5. 2 0 = _______ + _______

LESSON TWO – ADDITION OF WHOLE NUMBERS

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 – 5 + 8, 7 + 4, 6 + 5 + 7 etc. contained in addition cards.

1. 5 + 8 = 13

2. 7 + 4 = 11

3. 6 + 5 + 7 = 18

Quick Guide and Evaluation on two digit numbers –

1. 2 5 + 1 1

2. 3 2 + 2 6

Solutions 1

2 5 = 20 + 5

+ 1 1 = 10 + 1

_____________________

3 6 = 30 + 6

_____________________

Note – Emphasize more on arranging each digit of the numbers.

Solutions 2

3 2 = 30 + 2

+ 2 6 = 20 + 6

_____________________

5 8 = 50 + 8

_____________________

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

Quick Assessment

1. 5 1 and 3 4

2. 7 6 and 1 2

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

1. 5 1 + 3 6

2. 3 5 + 2 0

3. 3 0 + 1 1

LESSON THREE – 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 2 + 4 6

2. 2 2 + 2 3

Solution 1

3 5 + 4 1

3 5

+ 4 1

___________

7 6

___________

Solution 2

2 2 + 2 3

2 2

+ 2 3

___________

4 5

___________

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

1. 5 3 + 3 6

2. 3 4 + 2 0

3. 3 6 + 1 1

LESSON FOUR – 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. Revises addition of 1 – digit numbers without exchanging or renaming. Guides pupils on verbal addition using flash cards.

Pupil’s Activities – Revises addition of 1 – digit numbers without exchanging or renaming. Solve the verbal addition contained in addition cards.

3. Leads pupils to arrange counters in bundles of tens and write e.g. 35 sticks = 3 bundles of sticks and 5 pieces.

Pupil’s Activities – Arrange answers to the given problems.

4. Leads pupils to count and say the numbers in the expanded form and be able to write the numerals in that form e.g. 96 = 9 tens + 6 units.

Pupil’s Activities – Count and say the numbers in the in the expanded form and write the numerals.

5. Guides pupils to solve some addition problems on the board.

Pupil’s Activities – Add given 2-digit number on the board.

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:

add given 2 – digit numbers without exchanging or renaming.