# Subtraction of Whole Numbers Not Greater Than 18 (Primary 1)

MATHEMATICS

SECOND TERM

WEEK 7

PRIMARY 1

THEME – BASIC OPERATIONS

PREVIOUS LESSON – Second Term Scheme of Work and Plan Lesson Notes for MATHEMATICS Week 1 to Week 12 Primary Schools

TOPIC – SUBTRACTION OF WHOLE NUMBERS NOT GREATER THAN 18

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. subtract from whole numbers not greater than 18.

2. play games involving subtraction.

ENTRY BEHAVIOUR

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

1. Stones

2. Oranges

3. Bean seeds

4. Balls

5. bottle tops

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 – INTRODUCTION

Teacher’s/Pupil’s Activities 1 – Subtraction of Whole Numbers Not Greater Than 9

Introductory Questions

1. There are 12 ball in a basket. Michael took 3 out. How many balls remain in the basket?

⚽⚽⚽⚽⚽⚽⚽⚽⚽

(⚽⚽⚽)

12 take away 3 leaves 9.

2. There are 14 oranges in a bowl. Michael gave Segun and Ayomide 6 apples. How many oranges remain in the bowl?

🍎🍎🍎🍎🍎🍎🍎🍎

(🍎🍎🍎🍎🍎🍎)

14 take away 6.

14 take away 6 leaves 8.

Teacher’s/Pupil’s Activities 2 – Working Examples

⚽⚽⚽⚽⚽⚽⚽⚽⚽

(⚽⚽)

11 take away 2 leaves 9.

11 minus 2 leaves 9.

11 – 2 = 9

🥄🥄

(🥄🥄🥄🥄🥄🥄🥄🥄🥄🥄🥄🥄)

14 take away 12 leaves 2.

14 minus 12 leaves 2.

14 – 12 = 2

Pupil’s Activities 3 – Exercise/Take Home

Copy and complete the following.

🥕🥕🥕🥕🥕

(🥕🥕🥕🥕🥕🥕🥕🥕🥕)

14 take away 9 leaves =

14 minus 9 leaves =

14 – 9 =

🐦🐦🐦🐦🐦🐦🐦

(🐦🐦🐦🐦🐦🐦)

13 take away 6 leaves =

13 minus 6 leaves =

13 – 6 =

✏️✏️✏️✏️✏️✏️✏️

(✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️)

18 take away 11 leaves =

18 minus 11 leaves =

18 – 11 =

🍿🍿🍿🍿🍿🍿🍿🍿🍿🍿🍿🍿

(🍿🍿🍿🍿🍿)

17 take away 5 leaves =

17 minus 5 leaves =

17 – 5 =

LESSON TWO – COUNT AND TAKE AWAY

Teacher’s/Pupil’s Activities 1 – Working Examples

1. 18 take away 10

/ / / / / / / / / / / / / / / / / / /

18 — 10 = 8

2. 15 take away 5

/ / / / / / / / / / / / / / /

15 — 5 = 10

Pupil’s Activities 2 – Exercise/Take Home

1. Count 15 take away 14 =

15 — 14 =

2. Count 18 take away 12 =

18 — 12 =

3. Count 17 take away 15 =

17 — 15 =

4. Count 16 take away 9 =

16 — 9 =

LESSON THREE – SUBTRACT, USING COLUMN METHOD

Teacher’s/Pupil’s Activities 1

1.  6 – 4

6       / / / / / /

– 4

____

2

2. 7 — 5

7     / / / / / / /

– 5

____

2

Pupil’s Activities 2 – Exercise/Take Home

Subtract, using column method.

1. 4 — 2 =

2. 6 — 4 =

3. 8 — 2 =

4. 5 — 1 =

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 group a particular object e.g. bean seeds into sets of 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8.

Student’s Activities – Group objects such as bean seeds into 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8.

3. Guides/leads pupils to count a group of objects and take away a lesser number of the same objects fron the group e.g. in a group of 16 bean seeds take away 10 bean seeds.

Student’s Activities – Count one given group of objects and remove a lesser number of the same objects from the group.

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:

1. subtract given whole numbers not greater than 18.

2. mention two examples of everyday activities where accuracy in subtraction is required.

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