HomePrimary 3MathematicsAddition of 2-Digit and 3-Digit Numbers Using Partial Sum Method Mathematics Primary 3 First Term Lesson Notes Week 9

Addition of 2-Digit and 3-Digit Numbers Using Partial Sum Method Mathematics Primary 3 First Term Lesson Notes Week 9

Mathematics Lesson Plan for Primary 3

Subject: Mathematics

Class: Primary 3

Term: First Term

Week: 9

Age: 8 years

Topic: Addition of Numbers

Sub-topic: Addition of 2-Digit and 3-Digit Numbers Using Partial Sum Method

Duration: 60 minutes

Behavioural Objectives:

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

  1. Identify numbers from 701-720.
  2. Order numbers from 1-720.
  3. Count from 1-720.
  4. Write numbers from 400-720 in numerals and words.
  5. Skip count in 6s, 7s, 9s, and 10s.
  6. Add two 3-digit numbers using the partial sum method.
  7. Tell an addition story.
  8. Solve addition problems using the partial sum method in pairs and groups.

Keywords:

  • Addition
  • Partial Sum Method
  • 2-Digit Numbers
  • 3-Digit Numbers
  • Counting

Set Induction:

The teacher will demonstrate the partial sum method with simple examples on the board.

Entry Behaviour:

Pupils should have a basic understanding of addition and be familiar with counting and writing numbers.

Learning Resources and Materials:

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

Building Background/Connection to Prior Knowledge:

Pupils have learned about basic addition and the counting of numbers, which will be expanded using the partial sum method.

Embedded Core Skills:

  • Numeracy
  • Problem-solving
  • Collaborative work

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
  • Addition worksheets

Content:

  1. Identifying and Writing Numbers 701-720:
    • Recite and write numbers from 701 to 720 in numerals and words.
  2. Addition Using the Partial Sum Method:
    • Add two 2-digit numbers using partial sums (e.g., 76 + 19).
    • Add two 3-digit numbers using partial sums (e.g., 215 + 205).
  3. Addition Story:
    • Create a simple story problem involving addition and solve it using the partial sum method.
  4. Group Activities:
    • In pairs, add two 2-digit numbers using the partial sum method.
    • In small groups, use number flashcards to find partial sums for 3-digit numbers.

Evaluation

  1. 76 + 19 = __.
    a) 85
    b) 95
    c) 89
    d) 90
  2. 215 + 205 = __.
    a) 420
    b) 410
    c) 425
    d) 430
  3. 702 + 15 = __.
    a) 717
    b) 725
    c) 705
    d) 710
  4. What is the partial sum of 84 + 29?
    a) 113
    b) 114
    c) 112
    d) 120
  5. 389 + 214 = __.
    a) 603
    b) 604
    c) 605
    d) 600
  6. 127 + 189 = __.
    a) 316
    b) 317
    c) 320
    d) 315
  7. What is the sum of 253 and 146?
    a) 399
    b) 400
    c) 398
    d) 395
  8. 415 + 326 = __.
    a) 741
    b) 740
    c) 735
    d) 725
  9. 512 + 133 = __.
    a) 645
    b) 650
    c) 640
    d) 630
  10. 358 + 147 = __.
    a) 505
    b) 510
    c) 507
    d) 515
  11. 676 + 289 = __.
    a) 965
    b) 955
    c) 960
    d) 970
  12. What is the result of 547 + 225?
    a) 772
    b) 770
    c) 780
    d) 790
  13. Add 453 and 318. The total is __.
    a) 771
    b) 762
    c) 760
    d) 770
  14. 624 + 135 = __.
    a) 759
    b) 760
    c) 765
    d) 770
  15. What is 475 + 208?
    a) 683
    b) 680
    c) 690
    d) 675

Class Activity Discussion

  1. Q: What is the partial sum method in addition?
    A: It is a method where you add the numbers by place value (hundreds, tens, units) separately and then sum the results.
  2. Q: How do you add 2-digit numbers using the partial sum method?
    A: Break each number into tens and units, add the tens and units separately, then combine the results.
  3. Q: How do you add 3-digit numbers using the partial sum method?
    A: Break each number into hundreds, tens, and units, add each place value separately, then combine the results.
  4. Q: What is an example of adding two 2-digit numbers with partial sums?
    A: For 76 + 19: Add 70 + 10 = 80, then 6 + 9 = 15, and combine to get 95.
  5. Q: What is the benefit of using the partial sum method?
    A: It simplifies addition by breaking it into smaller, more manageable parts.
  6. Q: How do you handle carrying over in the partial sum method?
    A: Carry over is handled when combining the place values if the sum exceeds 10.
  7. Q: What should you do if the partial sums add up to more than 100?
    A: Combine the place values and carry over to the next place value as needed.
  8. Q: How can you tell an addition story?
    A: Create a real-life scenario involving addition, solve it using the partial sum method, and explain it.
  9. Q: How can you use flashcards for addition practice?
    A: Use flashcards with numbers to create addition problems and find partial sums in groups.
  10. Q: What is the sum of 76 and 19 using the partial sum method?
    A: 95.
  11. Q: How do you add 215 and 205 using partial sums?
    A: Add 200 + 200 = 400, then 15 + 5 = 20, and combine to get 420.
  12. Q: What is the partial sum of 345 + 167?
    A: 345 = 300 + 40 + 5 and 167 = 100 + 60 + 7. Add each place value separately: 300 + 100 = 400, 40 + 60 = 100, 5 + 7 = 12. Combine to get 400 + 100 + 12 = 512.
  13. Q: How do you write 720 in words?
    A: Seven hundred and twenty.
  14. Q: What is the result of adding 702 and 15 using the partial sum method?
    A: 717.
  15. Q: What is the importance of learning the partial sum method?
    A: It helps in understanding addition more deeply and handling larger numbers more effectively.

Presentation:

Step 1:
The teacher reviews the concept of addition and introduces the partial sum method.

Step 2:
The teacher demonstrates how to use the partial sum method with examples on the whiteboard.

Step 3:
The teacher organizes pupils into pairs and groups to practice addition using the partial sum method with number flashcards and worksheets. Provide guidance and corrections as needed.

Teacher’s Activities:

  • Demonstrate addition using the partial sum method.
  • Facilitate pair and group activities.
  • Provide feedback and corrections.

Learners’ Activities:

  • Practice adding 2-digit and 3-digit numbers using the partial sum method.
  • Solve addition problems in pairs and groups.
  • Participate in telling addition stories and solving real-life problems.

Assessment:

  • Evaluate pupils’ ability to use the partial sum method for addition.
  • Review group work and individual problem-solving.

Ten Evaluation Questions:

  1. What is the partial sum of 64 + 27?
  2. Add 153 and 234 using the partial sum method.
  3. How do you handle carrying over in the partial sum method?
  4. What is the result of 412 + 189?
  5. Write 625 in words.
  6. What is the sum of 345 and 256?
  7. How do you add 3-digit numbers using partial sums?
  8. Solve 482 + 235 using partial sums.
  9. What is an example of telling an addition story?
  10. What is 701 + 18 using the partial sum method?

Conclusion:

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

 

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