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

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.

 

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