# Counting Numbers 1 – 190 and Skip Count in 2s and 3s | Addition and Subtraction of Whole Numbers Primary 1 (Basic 1) Term 3 Week 3 Mathematics

### MATHEMATICS

THIRD TERM

WEEK 3

PRIMARY 1

THEME – WHOLE NUMBERS

PREVIOUS LESSON – Counting Numbers 1 – 180 and Skip Counting in 2s, 3s, 5s and 10s | Addition of Two Whole Numbers with Sum not More than 50 Primary 1 (Basic 1) Term 3 Week 2 Mathematics

### LEARNING AREA

1. Introductory Activities

2. Identification and Reading of Numbers 1 – 190

3. Writing of Numbers 1 – 190

4. Add and Count  in 2s and 3s

5. Addition and Subtraction of Whole Numbers

6. Lesson Evaluation and Weekly Assessment

### LEARNING OBJECTIVES

By the end of the lesson, most of the pupils should have attained the following objectives –

1. identify and read correctly the numbers 1 – 190.

2. write correctly the numbers 1 – 190.

3. count in 2s, 3s to 10s

4. identify mathematical signs.

5..add and substrate two whole numbers with sum not more 50.

### ENTRY BEHAVIOUR

The pupils can count 1 – 190 correctly and identify mathematical signs.

### INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of flashcards and number charts.

### 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

### LESSON 1 – INTRODUCTION

ACTIVITY 1 – COUNTING NUMBER 1 – 100 (10 MINUTES)

1     2     3     4     5     6     7     8     9    10

11   12   13   14   15   16   17   18   19  20

21   22   23   24   25   26   27   28   29  30

31   32   33   34   35   36   37   38   39  40

41   42   43   44   45   46   47   48   49  50, up to 190.

ACTIVITY 2 – SKIP COUNT IN  2s (10 MINUTES)

Count in 2s starting from 2,

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26,

28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50.

Count in 2s starting from 3,

3, 5, 8, 10, 12, 14, 16, up to 50.

Count in 2s starting from 4,

4, 6, 8, 10, 12, 14, 16, up to 50.

Count in 2 starting from 5,

5, 7, 9, 11, 13, 15, 17, up to 50.

ACTIVITY 3 – SKIP COUNT IN  3s (10 MINUTES)

Count in 3s starting from 3,

3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48

Count in 3s starting 1,

1, 4, 7, 10, 13, 16, 17, 20, 23, not more than 50.

Count in 3s starting from 2,

2, 5, 7, 9, 11, 14, 16, 19, 21, 24,, not more than 50.

Count 3s starting from 10,

10, 13, 16, 17, 20, 23, 26, 29, not more than 50.

### LESSON 2 – FUNCTIONS OF +, – AND =

ACTIVITY 1 – IDENTIFICATION OF +

+ means plus addition, sum or put together.

We put the sign the plus in between two numbers to show that the second number is added to the first number.

For example,

1 + 2

7 + 5

8 + 4, etc.

The sign looks like cross.

ACTIVITY 2 IDENTIFICATION OF –

– means minus, subtraction, take away or difference.

We put the sign the minus in between two numbers to show that the second number is take away from the first number.

2 – 1

4 – 2

11 – 6, etc.

The sign looks like dash sign.

ACTIVITY 3 – IDENTIFICATION OF =

= means equal to.

We put the sign after the addition or subtraction of two numbers to show that they are equal to the third number.

For example,

5 + 1 = 6

1 + 2 = 3

7 – 5 = 2

5 – 2 = 3, etc.

ACTIVITY 4 – WORK EXERCISE

1. Put addition sign between the two numbers,

• 5 and 3
• 7 and 4
• 2 and 3
• 6 and 6

2. Put subtraction in between the two numbers,

• 5 and 3
• 4 and 1
• 10 and 5
• 7 and 0

• 5 + 1 =
• 1 + 2 =
• 7 – 5 =
• 4 – 2 =

### LESSON 3 – SKIP COUNT IN 2s AND 3s

ACTIVITY 1 – SKIP COUNT IN 2s

Count in 2s

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26,

28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50.

2

2 + 2 = 4

4 + 2 = 6

6 + 2 = 8

8 + 2 = 10

10 + 2 = 12

12 + 2 = 14

14 + 2 = 16

16 + 2 = 18

18 + 2 = 20, etc. up to 50.

ACTIVITY 2 – SKIP COUNT IN 3s

Count in 3s

3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48

3

3 + 3 = 6

6 + 3 = 9

9 +12 = 12

12 + 3 = 15

15 + 3 = 18

18 + 3 = 21

21 + 3 = 24

24 + 3 = 27

27 + 3 = 30, etc. not more than 50.

ACTIVITY 3 – ADD AND COUNT EXERCISE

1. Add and count in 2s starting from 2 to 20.

2. Add and count in 2s starting from 5 to 21.

3. Add and count in 3s starting 3 to 24.

4. Add and count in 3s starting from 5 to 29.

1. Add and count in 2s starting from 2 to 20.

2

2 + 2 = 4

4 + 2 = 6

6 + 2 = 8

8 + 2 = 10

10 + 2 = 12

12 + 2 = 14

14 + 2 = 16

16 + 2 = 18

18 + 2 = 20

Count in 2

2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20

2. Add and count in 2s starting from 5 to 21.

5

5 + 2 = 7

7 + 2 = 9

9 + 2 = 11

11 + 2 = 13

13 + 2 = 15

15 + 2 = 17

17 + 2 = 19

19 + 2 = 21

3. Add and count in 3s starting 3 to 24.

3

3 + 3 = 6

6 + 3 = 9

9 + 3 = 12

12 + 3 = 15

15 + 3 = 15

15 + 3 = 18

18 + 3 = 21

21 + 3 = 25

Count in 3s

3, 6, 9, 12, 15, 18, 21, 24

4. Add and count in 3s starting from 5 to 29.

5

5 + 3 = 8

8 + 3 = 11

11 + 3 = 14

14 + 3 = 17

17 + 3 = 20

20 + 3 = 23

23 + 3 = 26

26 + 6 = 29

Count in 3s

5, 8, 11, 14, 17, 20, 23, 26, 29

### LESSON 4 – ADDITION OF WHOLE NUMBERS NOT MORE THAN 50

ACTIVITY 1 – ADDITION OF ONE DIGIT NUMBER UP TO 50

Working Example 1

Count and add together the following books,

📘📘📘📘📘

📘📘📘📘📘📘📘📘📘📘📘📘

📘📘📘📘📘📘 + 📘📘📘📘📘📘📘📘📘📘📘📘

= 📘📘📘📘📘📘📘📘📘📘📘📘📘📘📘📘📘📘

6 + 12 = 18

Working Example 2

Add 5 pens and 5 pens together.

5 pens + 7 pens = 12 pens

Working Examples 3

• 10 and 5
• 11 and 7
• 30 and 5
• 10 and 10

SOLUTIONS

• 10 + 5 = 15
• 11 + 7 = 18
• 30 + 5 = 35
• 10 + 10 = 20

ACTIVITY 2 – WORKING EXERCISE

1. Add the following numbers together,

• 11 and 15
• 15 and 6
• 23 and 17
• 17 and 17

2. Complete the following with a number, addition or  equal to signs,

• 10 __ 5 = 15
• 10 + 7 __ 17
• __ + 8 = 10
• __ + __ = 7

### LESSON 5 – SUBTRACTION OF WHOLE NUMBERS NOT MORE THAN 50

ACTIVITY 1 – SUBTRACTION OF ONE DIGIT NUMBER UP TO 50

Working Example 1

Count and subtract the second from the first books the following books,

1st – 📘📘📘📘📘📘📘📘📘📘📘📘

2nd – 📘📘📘📘📘

📘📘📘📘📘📘📘📘📘📘📘📘 – 📘📘📘📘📘

= 📘📘📘📘📘📘📘

12 + 5 = 7

Working Example 2

Subtract 15 from 26.

26 – 15 = 11

Working Examples 3

Substrate the first number from the second one,

• 10 and 15
• 11 and 27
• 30 and 45
• 10 and 10

SOLUTIONS

• 15 – 10 = 5
• 27 – 11 = 16
• 45 – 30 = 15
• 10 – 10 = 0

ACTIVITY 2 – WORKING EXERCISE

1. Substrate the first number from the second one,

• 23 and 13
• 15 and ql16
• 23 and 17
• 17 and 17

2. Complete the following with a number, subtraction or  equal to signs,

• 10 __ 5 = 5
• 10 – 7 __ 3
• __ – 8 = 10
• __ – __ = 7

### 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. Teacher uses flashcards and number chart to lead a counting from 1 – 190 with appropriate lesson evaluation.

Pupil’s Activities – Pay attention to the lesson introduction and follow the teacher’s lead to identify and count numbers.

3. Teacher displays number charts showing count in 2s, 3s, 5s and 10s.

Pupil’s Activities – Examine and identify the missing numbers.

4. Teacher displays flashcards showing mathematical signs (symbols) such as +, – and =.

5. Teacher lets pupils identify each sign and uses their responses to discuss the uses of the signs.

6. Teacher gives more examples to illustration the uses of +, – and = with names.

Pupil’s Activities – Identify addition, subtraction and equal to signs and use them correctly.

7. Teacher uses the number charts to introduce the lesson and guide the children to skip count correctly in 2s and 3s.

8. Teacher uses the activities in step 4 to guide pupils to add and count in 2s and 3s.

Pupil’s Activities – Follow the teacher’s guides to add and count in 2s and 3s.

9. Teacher leads addiction and subtraction of whole numbers not more 50.

Pupil’s Activities – Add and subtract two whole not more than 50.

10. Teacher summarizes the lessons with appropriate lesson evaluation.

Pupil’s Activities – Participate actively in the summary of the lesson by responding correctly to the questions and write as instructed.

### CONCLUSION

To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.