Subtraction of Two 2-Digit and 3-Digit Numbers with and without Renaming Mathematics Primary 3 First Term Lesson Notes Week 10

Mathematics Lesson Plan for Primary 3

Subject: Mathematics

Class: Primary 3

Term: First Term

Week: 10

Age: 8 years

Topic: Subtraction of Numbers

Sub-topic: Subtraction of Two 2-Digit and 3-Digit Numbers with and without Renaming

Duration: 60 minutes

Behavioural Objectives:

By the end of the lesson, pupils should be able to:

1. Identify numbers from 721-750.
2. Order numbers from 1-750.
3. Count from 1-750.
4. Write numbers from 401-750 in numerals and words.
5. Reverse count from 750 to 721.
6. Skip count in 3s, 5s, 6s, 75s, 9s, and 10s.
7. Subtract two 2-digit and 3-digit numbers without renaming.
8. Subtract two 2-digit and 3-digit numbers with renaming.
9. Solve real-life subtraction problems.

Keywords:

• Subtraction
• Partial Sum Method
• Renaming
• Counting
• Real-Life Problems

Set Induction:

The teacher will introduce the concept of subtraction using simple examples on the board, showing both methods (with and without renaming).

Entry Behaviour:

Pupils should be familiar with basic subtraction and counting, including the concept of renaming in subtraction.

Learning Resources and Materials:

• Number flashcards
• Whiteboard and markers
• Subtraction worksheets
• Counters

Building Background/Connection to Prior Knowledge:

Pupils have previously learned addition and basic subtraction, which will be expanded to include subtraction with and without renaming.

Embedded Core Skills:

• Numeracy
• Problem-solving
• Critical thinking

Learning Materials:

• Mathematics Textbook
• Workbooks
• Flashcards

Reference Books:

• Lagos State Scheme of Work
• Mathematics Textbook for Primary 3

Instructional Materials:

• Number flashcards
• Whiteboard and markers
• Subtraction worksheets

Content:

1. Identifying and Writing Numbers 721-750:
   • Recite and write numbers from 721 to 750 in numerals and words.
2. Subtraction Without Renaming:
   • Subtract two 2-digit numbers where no renaming is required (e.g., 54 – 23).
3. Subtraction With Renaming:
   • Subtract two 2-digit and 3-digit numbers where renaming is required (e.g., 73 – 48, 405 – 178).
4. Counting and Skip Counting:
   • Count from 1 to 750 and skip count in 3s, 5s, 6s, 75s, 9s, and 10s.
5. Solving Real-Life Problems:
   • Create and solve real-life subtraction problems using both methods.

Evaluation

1. 73 – 48 = __.
   a) 25
   b) 20
   c) 22
   d) 23
2. 405 – 178 = __.
   a) 227
   b) 230
   c) 220
   d) 240
3. 54 – 23 = __.
   a) 31
   b) 29
   c) 30
   d) 32
4. What is 721 – 195?
   a) 526
   b) 530
   c) 525
   d) 510
5. 112 – 58 = __.
   a) 54
   b) 55
   c) 56
   d) 57
6. What is 256 – 139?
   a) 117
   b) 118
   c) 120
   d) 115
7. Subtract 689 – 284.
   a) 405
   b) 410
   c) 400
   d) 420
8. 93 – 47 = __.
   a) 46
   b) 45
   c) 50
   d) 47
9. What is 742 – 388?
   a) 354
   b) 355
   c) 360
   d) 350
10. 311 – 176 = __.
    a) 135
    b) 140
    c) 130
    d) 125
11. What is the result of 562 – 249?
    a) 313
    b) 310
    c) 320
    d) 315
12. Subtract 88 – 49.
    a) 39
    b) 40
    c) 35
    d) 45
13. What is 702 – 367?
    a) 335
    b) 340
    c) 330
    d) 320
14. 846 – 457 = __.
    a) 389
    b) 390
    c) 400
    d) 385
15. 785 – 299 = __.
    a) 486
    b) 485
    c) 490
    d) 480

Class Activity Discussion

1. Q: What is subtraction without renaming?
   A: Subtraction where you do not need to borrow from the next place value because the top digit is greater than the bottom digit in each column.
2. Q: What is subtraction with renaming?
   A: Subtraction where you need to borrow from the next place value because the top digit is less than the bottom digit in a column.
3. Q: How do you subtract 2-digit numbers without renaming?
   A: Subtract directly when the top digit is greater than or equal to the bottom digit in each column.
4. Q: How do you subtract 2-digit numbers with renaming?
   A: Borrow from the next higher place value when needed and then subtract.
5. Q: What is the partial sum method in subtraction?
   A: It is not used for subtraction. Instead, focus on borrowing if necessary.
6. Q: What should you do if you need to borrow in subtraction?
   A: Subtract from the next higher place value and adjust the digits accordingly.
7. Q: How do you handle borrowing in 3-digit subtraction?
   A: Borrow from the hundreds place if needed, then perform the subtraction.
8. Q: What is 72 – 48 using renaming?
   A: Borrow from the tens place: 72 becomes 60 and 12, so 60 + 12 – 48 = 24.
9. Q: What is 430 – 215?
   A: Subtract directly: 430 – 200 = 230, 30 – 15 = 15. Combine to get 215.
10. Q: How do you count backwards from 750?
    A: Start from 750 and subtract the counting interval, such as 10, 20, etc.
11. Q: What is 621 – 305?
    A: Subtract directly: 621 – 300 = 321, 21 – 5 = 16. Combine to get 316.
12. Q: How do you skip count in 5s from 721?
    A: Count 721, 726, 731, and so on, adding 5 each time.
13. Q: What is the importance of learning subtraction with and without renaming?
    A: It helps handle different types of subtraction problems and improve mathematical skills.
14. Q: How do you solve real-life subtraction problems?
    A: Create a scenario where subtraction is needed and apply the appropriate method.
15. Q: What is 794 – 578?
    A: Subtract directly: 794 – 500 = 294, 294 – 78 = 216.

Presentation:

Step 1:
The teacher revises the basic subtraction methods and introduces subtraction with and without renaming using examples.

Step 2:
The teacher demonstrates subtraction problems on the whiteboard, showing both methods clearly.

Step 3:
Pupils practice subtraction problems in pairs and small groups, using worksheets and number flashcards. The teacher provides feedback and corrections as needed.

Teacher’s Activities:

• Demonstrate subtraction methods.
• Facilitate pair and group activities.
• Review and provide feedback on pupils’ work.

Learners’ Activities:

• Practice subtraction problems with and without renaming.
• Participate in group activities and solve real-life problems.
• Share and discuss solutions with peers.

Assessment:

• Evaluate pupils’ ability to perform subtraction with and without renaming.
• Review group work and individual problem-solving skills.

Ten Evaluation Questions:

1. What is 721 – 198?
2. Subtract 468 from 752.
3. How do you borrow in subtraction?
4. What is the result of 630 – 275?
5. Write 750 in words.
6. How do you subtract 3-digit numbers with renaming?
7. Solve 489 – 234.
8. What is 826 – 459?
9. Subtract 219 from 450.
10. What is 642 – 378?

Conclusion:

The teacher will go around to check pupils’ work, provide feedback, and offer additional help where needed.