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:
- Identify numbers from 721-750.
- Order numbers from 1-750.
- Count from 1-750.
- Write numbers from 401-750 in numerals and words.
- Reverse count from 750 to 721.
- Skip count in 3s, 5s, 6s, 75s, 9s, and 10s.
- Subtract two 2-digit and 3-digit numbers without renaming.
- Subtract two 2-digit and 3-digit numbers with renaming.
- 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:
- Identifying and Writing Numbers 721-750:
- Recite and write numbers from 721 to 750 in numerals and words.
- Subtraction Without Renaming:
- Subtract two 2-digit numbers where no renaming is required (e.g., 54 – 23).
- Subtraction With Renaming:
- Subtract two 2-digit and 3-digit numbers where renaming is required (e.g., 73 – 48, 405 – 178).
- Counting and Skip Counting:
- Count from 1 to 750 and skip count in 3s, 5s, 6s, 75s, 9s, and 10s.
- Solving Real-Life Problems:
- Create and solve real-life subtraction problems using both methods.
Evaluation
- 73 – 48 = __.
a) 25
b) 20
c) 22
d) 23 - 405 – 178 = __.
a) 227
b) 230
c) 220
d) 240 - 54 – 23 = __.
a) 31
b) 29
c) 30
d) 32 - What is 721 – 195?
a) 526
b) 530
c) 525
d) 510 - 112 – 58 = __.
a) 54
b) 55
c) 56
d) 57 - What is 256 – 139?
a) 117
b) 118
c) 120
d) 115 - Subtract 689 – 284.
a) 405
b) 410
c) 400
d) 420 - 93 – 47 = __.
a) 46
b) 45
c) 50
d) 47 - What is 742 – 388?
a) 354
b) 355
c) 360
d) 350 - 311 – 176 = __.
a) 135
b) 140
c) 130
d) 125 - What is the result of 562 – 249?
a) 313
b) 310
c) 320
d) 315 - Subtract 88 – 49.
a) 39
b) 40
c) 35
d) 45 - What is 702 – 367?
a) 335
b) 340
c) 330
d) 320 - 846 – 457 = __.
a) 389
b) 390
c) 400
d) 385 - 785 – 299 = __.
a) 486
b) 485
c) 490
d) 480
Class Activity Discussion
- 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. - 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. - 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. - Q: How do you subtract 2-digit numbers with renaming?
A: Borrow from the next higher place value when needed and then subtract. - Q: What is the partial sum method in subtraction?
A: It is not used for subtraction. Instead, focus on borrowing if necessary. - 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. - Q: How do you handle borrowing in 3-digit subtraction?
A: Borrow from the hundreds place if needed, then perform the subtraction. - Q: What is 72 – 48 using renaming?
A: Borrow from the tens place: 72 becomes 60 and 12, so 60 + 12 – 48 = 24. - Q: What is 430 – 215?
A: Subtract directly: 430 – 200 = 230, 30 – 15 = 15. Combine to get 215. - Q: How do you count backwards from 750?
A: Start from 750 and subtract the counting interval, such as 10, 20, etc. - Q: What is 621 – 305?
A: Subtract directly: 621 – 300 = 321, 21 – 5 = 16. Combine to get 316. - Q: How do you skip count in 5s from 721?
A: Count 721, 726, 731, and so on, adding 5 each time. - 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. - Q: How do you solve real-life subtraction problems?
A: Create a scenario where subtraction is needed and apply the appropriate method. - 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:
- What is 721 – 198?
- Subtract 468 from 752.
- How do you borrow in subtraction?
- What is the result of 630 – 275?
- Write 750 in words.
- How do you subtract 3-digit numbers with renaming?
- Solve 489 – 234.
- What is 826 – 459?
- Subtract 219 from 450.
- What is 642 – 378?
Conclusion:
The teacher will go around to check pupils’ work, provide feedback, and offer additional help where needed.