Addition of Two Digit Numbers Under Tens and Units With and Without Regrouping Mathematics Primary 3 First Term Lesson Notes Week 8

Subject : 

Mathematics

Term :

First Term

Week:

Week 5

Class :

Primary 3/ Basic 3

Topic : Addition of two digit numbers under Tens and Units

Previous lesson : 

The pupils have previous knowledge of introduction to fractions with different shapes like circle , squares, rectangles etc

 

Behavioural objectives :

At the end of the lesson, the pupils should be able to

• Understand how to arrange two digit figures under tens and Units.
• Explain the process that is involved in simple additions under tens and Units.
• Use pebbles, counters, abacus or other learning materials to solve questions on simple addition of numbers under tens and units

 

Instructional Materials :

• Wall charts
• Pictures
• Related Online Video
• Flash Cards
• Lagos state scheme of work on Mathematics
• TextBooks
• Workbooks
• Pebbles
• Abacus

Methods of Teaching :

• Class Discussion
• Group Discussion
• Asking Questions
• Explanation
• Role Modelling
• Role Delegation

 

Reference Materials :

• Scheme of Work
• Online Information
• Textbooks
• Workbooks
• 9 Year Basic Education Curriculum
• Workbooks

 

 

Content: (5 minutes)

1. Introduction to two-digit addition.
2. Adding two-digit numbers without regrouping.
3. Adding two-digit numbers with regrouping.
4. Practice exercises and problem-solving.

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1. How to Add Two-Digit Numbers Without Regrouping:

✏️ Step 1: Write the numbers in a vertical column, one on top of the other.

Example: 24

• 13

✏️ Step 2: Start adding from the right side (units place) and move to the left.

Example: 4 + 3 = 7

✏️ Step 3: Write down the result below the line.

Example: 24

• 13 7

✏️ Step 4: Move to the tens place and add those digits.

Example: 2 + 1 = 3

✏️ Step 5: Write down the final result.

Example: 24

• 13 37

2. How to Add Two-Digit Numbers With Regrouping:

✏️ Step 1: Follow the same process of writing the numbers in a vertical column.

Example: 48

• 57

✏️ Step 2: Start adding from the right side (units place) as usual.

Example: 8 + 7 = 15

✏️ Step 3: Write down only the “5” in the units place result.

Example: 48

• 57 5

✏️ Step 4: But this time, carry over the “1” to the tens place.

Example: 4 + 5 + 1 = 10

✏️ Step 5: Write down the “0” in the tens place result.

Example: 48

• 57 05

✏️ Step 6: Add the tens place digits, including the carried-over number.

Example: 4 + 5 + 1 = 10

✏️ Step 7: Write down the final result.

Example: 48

• 57 105

 

3. Understanding the Difference:

🧐 The key difference is when you have to carry over (regroup). In the first method, you simply add from right to left. In the second method, when the sum is 10 or more in the units place, you carry over to the tens place.

4. Applying Addition to Real-Life Situations:

💼 Addition is like counting things, combining numbers, or finding the total. In real life, we use addition when we shop, count money, calculate scores in games, and much more. It helps us solve everyday problems!

🔢 So, remember, whether it’s simple addition or carrying over, math is all around us! 🌟

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Evaluation:

1. To add two-digit numbers without regrouping, start from the _______ place. a) Units b) Tens c) Hundreds d) Thousands
2. In addition without regrouping, when you add 7 and 9, the result is _______. a) 15 b) 16 c) 8 d) 12
3. When you add two-digit numbers without regrouping, the sum of 28 + 47 is _______. a) 64 b) 85 c) 45 d) 75
4. In addition without regrouping, the numbers in the tens place are added _______. a) Vertically b) Horizontally c) Diagonally d) Circularly
5. To add two-digit numbers with regrouping, you carry over a digit when the sum in the units place is _______. a) Less than 5 b) 10 or more c) Equal to 9 d) Odd
6. In addition with regrouping, when you add 38 + 47, the carried-over digit is _______. a) 1 b) 5 c) 7 d) 8
7. To understand the difference between adding with and without regrouping, you need to know about _______ place values. a) Oneness b) Tenness c) Tens and Units d) Hundredness
8. The main difference between adding with and without regrouping is the process of _______. a) Subtracting b) Multiplying c) Carrying over d) Dividing
9. In real-life situations, addition helps us calculate things like _______ when we shop. a) The weather b) Our age c) Change d) Our shoe size
10. Adding numbers is like combining them to find the _______. a) Difference b) Total c) Product d) Quotient
11. What do you carry over when adding two-digit numbers with regrouping? a) An umbrella b) A bag of candy c) A digit d) A secret
12. In addition with regrouping, if the sum in the units place is 10 or more, you write down only the _______ digit. a) First b) Second c) Third d) Fourth
13. To apply addition to real-life situations, you can use it for calculating _______ when you go shopping. a) The time b) Your friends’ names c) Change d) The weather
14. Adding two-digit numbers without regrouping is like adding numbers in a _______. a) Sideways direction b) Circular pattern c) Vertical column d) Zigzag fashion
15. When you add two-digit numbers with regrouping, you may carry over a digit to the _______ place. a) Units b) Tens c) Hundreds d) Thousands

Presentation: (15 minutes)

Step 1: Introduction (5 minutes)

• Explain that today we will learn to add two-digit numbers.
• Give examples of real-life situations where we need to add numbers.

Step 2: Adding Without Regrouping (5 minutes)

• Demonstrate how to add two-digit numbers without regrouping (e.g., 34 + 27).
• Use the whiteboard and number cards to show the process.
• Ask students to solve similar problems on their own.

Step 3: Adding With Regrouping (5 minutes)

• Explain that sometimes we need to regroup (carry over) when adding.
• Demonstrate the process (e.g., 58 + 47).
• Have students practice regrouping in similar problems.

Step 4: Practice Exercises (5 minutes)

• Provide worksheets with a mix of problems for students to solve.
• Walk around the class to assist and check their work.

Step 5: Real-Life Application (5 minutes)

• Discuss how addition is used in everyday life (e.g., calculating change, shopping).
• Encourage students to share examples.

Teacher’s Activities: (5 minutes)

• Introduce the topic and explain concepts.
• Demonstrate addition methods.
• Provide guidance and assistance during practice.

Learners’ Activities: (5 minutes)

• Listen and take notes.
• Solve problems individually and in groups.
• Participate actively in discussions.

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Evaluation Questions: (5 minutes)

1. What is the topic of today’s lesson? a) Subtraction b) Multiplication c) Addition d) Division
2. What is the key objective of this lesson? a) To learn subtraction b) To practice multiplication c) To understand addition with regrouping d) To explore division concepts
3. When do we need to use addition in our daily lives? a) When baking cookies b) When solving puzzles c) When making friends d) When playing video games
4. What is regrouping in addition? a) Moving to a new classroom b) Combining numbers into one group c) Asking a teacher for help d) Counting without using fingers
5. What is the result of 25 + 17 without regrouping? a) 42 b) 52 c) 31 d) 13
6. In 38 + 49, do we need to regroup or carry over a digit? a) Yes b) No c) Maybe d) I don’t know
7. What is the result of 57 + 26 with regrouping? a) 83 b) 64 c) 117 d) 37
8. How can you use addition in a real-life situation? a) To fly to the moon b) To calculate change when shopping c) To bake a cake d) To play a soccer game
9. When you add two numbers, what do you find? a) The difference b) The product c) The sum d) The quotient
10. In 46 + 39, how do you solve it with regrouping? a) By eating cookies b) By carrying over a digit c) By running fast d) By doing a dance

Conclusion: (5 minutes)

• Summarize what was learned in the lesson.
• Emphasize the importance of addition in everyday life.

 

Comparison of fractions by ordering