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

MATHEMATICS

FIRST TERM

WEEK 10

PRIMARY 2

THEME – WHOLE NUMBERS

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

TOPIC – SUBTRACTION OF WHOLE NUMBERS

LEARNING AREA

1. Introductory Activities

2. Subtraction 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 –

subtract 2 – digit numbers without exchanging or renaming.

ENTRY BEHAVIOUR

Subtraction 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

SUBTRACTION OF 2 DIGIT WHOLE NUMBERS (10 minutes)

Teacher’s/Pupil’s Activities – Guides pupils on oral additions using subtraction cards. Flash the subtraction 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.

1. 8 – 5 = 3

2. 7 – 4 = 3

3. 6 – 5 = 1

Quick Guide and Evaluation on two digit numbers –

1. 2 5 – 1 1

2. 3 8 – 2 6

Solutions 1

2 5 = 20 + 5

– 1 1 = 10 + 1

_____________________

1 4 = 10 + 4

_____________________

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

Solutions 2

3 8 = 30 + 8

– 2 6 = 20 + 6

_____________________

1 2 = 10 + 2

_____________________

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

Quick Assessment

Subtract the following –

1. 5 9 and 3 4

2. 7 6 and 1 2

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

1. 5 1 – 3 0

2. 3 5 – 2 0

3. 3 9 – 1 1

LESSON TWO – SUBTRACTION OF WHOLE NUMBERS DIRECT METHOD

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

Working Examples

1. 3 5 – 1 1

2. 6 5 – 2 3

Solution 1

3 5 – 1 1

3 5

– 1 1

___________

2 4

___________

Solution 2

6 5 – 2 3

6 5

– 2 3

___________

4 2

___________

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

1. 5 3 – 3 6

2. 3 4 – 2 0

3. 3 6 – 1 1

LESSON THREE I FOUR – REVISION AND 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 subtraction of 1 – digit numbers without exchanging or renaming. Guides pupils on verbal subtraction using flash cards.

Pupil’s Activities – Revises subtraction of 1 – digit numbers without exchanging or renaming. Solve the verbal subtraction contained in subtraction 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 subtraction problems on the board.

Pupil’s Activities – Subtract 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.
• Next Lesson –

LESSON EVALUATION

Pupils to:

subtract given 2 – digit numbers without exchanging or renaming.

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