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:
- Identify numbers from 701-720.
- Order numbers from 1-720.
- Count from 1-720.
- Write numbers from 400-720 in numerals and words.
- Skip count in 6s, 7s, 9s, and 10s.
- Add two 3-digit numbers using the partial sum method.
- Tell an addition story.
- 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:
- Identifying and Writing Numbers 701-720:
- Recite and write numbers from 701 to 720 in numerals and words.
- 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).
- Addition Story:
- Create a simple story problem involving addition and solve it using the partial sum method.
- 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
- 76 + 19 = __.
a) 85
b) 95
c) 89
d) 90 - 215 + 205 = __.
a) 420
b) 410
c) 425
d) 430 - 702 + 15 = __.
a) 717
b) 725
c) 705
d) 710 - What is the partial sum of 84 + 29?
a) 113
b) 114
c) 112
d) 120 - 389 + 214 = __.
a) 603
b) 604
c) 605
d) 600 - 127 + 189 = __.
a) 316
b) 317
c) 320
d) 315 - What is the sum of 253 and 146?
a) 399
b) 400
c) 398
d) 395 - 415 + 326 = __.
a) 741
b) 740
c) 735
d) 725 - 512 + 133 = __.
a) 645
b) 650
c) 640
d) 630 - 358 + 147 = __.
a) 505
b) 510
c) 507
d) 515 - 676 + 289 = __.
a) 965
b) 955
c) 960
d) 970 - What is the result of 547 + 225?
a) 772
b) 770
c) 780
d) 790 - Add 453 and 318. The total is __.
a) 771
b) 762
c) 760
d) 770 - 624 + 135 = __.
a) 759
b) 760
c) 765
d) 770 - What is 475 + 208?
a) 683
b) 680
c) 690
d) 675
Class Activity Discussion
- 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. - 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. - 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. - 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. - Q: What is the benefit of using the partial sum method?
A: It simplifies addition by breaking it into smaller, more manageable parts. - 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. - 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. - 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. - Q: How can you use flashcards for addition practice?
A: Use flashcards with numbers to create addition problems and find partial sums in groups. - Q: What is the sum of 76 and 19 using the partial sum method?
A: 95. - 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. - 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. - Q: How do you write 720 in words?
A: Seven hundred and twenty. - Q: What is the result of adding 702 and 15 using the partial sum method?
A: 717. - 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:
- What is the partial sum of 64 + 27?
- Add 153 and 234 using the partial sum method.
- How do you handle carrying over in the partial sum method?
- What is the result of 412 + 189?
- Write 625 in words.
- What is the sum of 345 and 256?
- How do you add 3-digit numbers using partial sums?
- Solve 482 + 235 using partial sums.
- What is an example of telling an addition story?
- 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.