# Open Sentences (Primary 2)

MATHEMATICS

WEEK 7

SECOND TERM

PRIMARY 2

THEME – ALGEBRAIC PROCESSES

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

TOPIC – OPEN SENTENCES

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. find missing numbers in an open sentence.

2. Solve simple related quantitative aptitude problems.

ENTRY BEHAVIOUR

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

1. Bottle tops

2. Number cards

3. Dot cards

4. Pupils themselves.

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 TO OPEN SENTENCES

Teacher’s/Pupil’s Activities 1 – Introductory Questions

Question 1 – There are 15 pencils in a box. More pencils are added to the box. Altogether there are 21 pencils. How many pencils added to the box?

✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️ (✏️✏️✏️✏️✏️✏️✏️)  =  ✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️✏️

15 pencils + (__) pencils = 21 pencils

Question 2 – Michael removed 11 oranges from a basket. There are 12 oranges left in the jar. How many oranges are there in the baskets?

(🍎🍎🍎🍎🍎🍎🍎🍎🍎🍎🍎)

🍎🍎🍎🍎🍎🍎🍎🍎🍎

🍎🍎🍎

(__) oranges — 11 oranges = 12 oranges

Pupil’s Activities 2 – Class Exercises/Take Home

1. Kemi bought 8 eggs from one market. He bought more eggs from another market. Altogether he bought 15 eggs. How many more eggs did she buy?

🥚🥚🥚🥚🥚🥚🥚🥚  +  (__)

= 🥚🥚🥚🥚🥚🥚🥚🥚🥚🥚🥚🥚🥚🥚🥚

2. Michael added 11 books to some that are already in the box. There are 19 books altogether in the box. How many books were formerly in the box?

📏📏📏📏📏📏📏📏📏📏📏  +  (__)

= 📏📏📏📏📏📏📏📏📏📏📏📏📏📏📏📏📏📏📏

LESSON TWO – OPEN SENTENCES

Teacher’s/Pupil’s Activities 1 – Finding the Missing Numbers in Addition Sentences

1. 11 oranges + (__) oranges = 16 oranges

2. 8 books + (__) books = 15 books

3. (__) rulers + 14 rulers = 28 rulers

4. (__) books + 14 books = 20 books

5. (__) sharpeners + 5 sharpeners = 16 sharpeners

Pupil’s Activities 2 – Class Exercises/Take Home

Copy out and find the missing numbers.

1. 15 + (__) = 20

2. (__) + 13 = 25

3. 13 + (__) = 35

4. (__) + 15 = 26

5. 17 + (__) = 31

6. (__) + 25 = 40

LESSON THREE – OPEN SENTENCES

Teacher’s/Pupil’s Activities 1 – Finding the Missing Numbers in Subtraction Sentences

1. 11 oranges — (__) oranges = 6 oranges

2. 18 books — (__) books = 15 books

3. (__) rulers — 14 rulers = 8 rulers

4. (__) books — 14 books = 2 books

5. (__) sharpeners — 5 sharpeners = 16 sharpeners

Pupil’s Activities 2 – Class Exercises/Take Home

Copy out and find the missing numbers.

1. 15 — (__) = 2

2. (__) — 13 = 25

3. 13 — (__) = 10

4. (__) — 15 = 20

5. 17 — (__) = 5

6. (__) — 25 = 40

LESSON FOUR – QUANTITATIVE REASONING

As stated in Quantitative Reasoning and Textbooks

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 find missing numbers.

Pupil’s Activities – Solve series of problems involving open sentences.

3. Guides pupils to solve simple related quantitative aptitude problems.

Pupil’s Activities –  Solve simple related quantitative aptitude problems.

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. solve given problems on open sentences.

2. find missing numbers in a simple related quantitative aptitude problems.