Nigeria - Primary 2 - General Mathematics - Addition

Nigeria - Primary 2 - General Mathematics - Addition

Lessonotes Nigeria curriculum lesson video for Primary 2 General Mathematics. This lesson focuses on Addition for classroom teaching, revision, and home learning.

Country: Nigeria
Grade: Primary 2
Subject: General Mathematics
Scheme: Lessonotes Curriculum
Theme: Basic Operations
Period: Term 1
Week: 3

Performance Objectives
1. add 2-digit numbers with out exchanging or renaming;
2. add 3-digit numbers with out exchanging or renaming;
3. add 2-digit numbers with exchanging or renaming;
4. add 3 numbers taking two at a time.

Lesson Content
Grade / Level: Primary 2
Subject: General Mathematics
Theme: Basic Operations
Topic: Addition
Term: 1st Term
Week: 3

---

### 1. Overview and Learning Objectives

This lesson focuses on developing students' foundational understanding and skills in addition, a core component of basic operations in mathematics. Addition is fundamental for daily life activities, such as counting objects, calculating quantities, managing money, and understanding numerical relationships. Mastering addition skills is crucial for students' progression in mathematics and their ability to solve practical problems in the Nigerian context.

By the end of this lesson, students will be able to:
* Add two-digit numbers where the sum of the units (ones) does not require carrying over to the tens place.
* Add three-digit numbers where the sum of units, tens, and hundreds does not require carrying over.
* Add two-digit numbers where the sum of the units (ones) requires carrying over (exchanging/renaming) to the tens place.
* Add three given numbers by adding the first two numbers and then adding the third number to the result.

**Real-world Connections in Nigeria:**
These objectives enable students to:
* Calculate the total number of items, like oranges or mangoes, bought from a local market stall.
* Determine the combined number of students in different primary classes in their school.
* Sum up the amounts of money saved over a few days for buying a school supply or snack.
* Find the total number of tubers of yam or bags of rice harvested or sold.

---

### 2. Key Concepts and Explanations

**Definition of Addition:**
Addition is the process of combining two or more numbers or quantities to find their total sum. The symbol for addition is `+` (plus). When numbers are added, the result is called the 'sum' or 'total'.

**Place Value Review:**
Before embarking on addition, it is crucial to review place value (Units, Tens, Hundreds) as it underpins vertical addition, especially with exchanging.
* **Units (Ones):** Represents single items (e.g., 1, 2, ..., 9).
* **Tens:** Represents groups of ten (e.g., 10, 20, ..., 90). One ten is equal to ten units.
* **Hundreds:** Represents groups of one hundred (e.g., 100, 200, ..., 900). One hundred is equal to ten tens.

**Types of Addition Covered in this Lesson:**

**A. Adding 2-Digit Numbers Without Exchanging (Renaming)**
This involves adding two numbers where the sum of the units column is 9 or less, and the sum of the tens column is also within single digits (or less than 10).
* **Method:**
1. Arrange the numbers vertically, aligning the units digits and the tens digits.
2. Add the digits in the units column first.
3. Add the digits in the tens column.

* **Worked Example 1:** Aminu has 23 kola nuts, and his friend Musa has 14 kola nuts. How many kola nuts do they have altogether?
* **Step 1:** Arrange vertically.
```
T U
2 3
+ 1 4
-----
```
* **Step 2:** Add the Units column (3 + 4 = 7). Write 7 under the Units column.
```
T U
2 3
+ 1 4
-----
7
```
* **Step 3:** Add the Tens column (2 + 1 = 3). Write 3 under the Tens column.
```
T U
2 3
+ 1 4
-----
3 7
```
* **Answer:** They have 37 kola nuts altogether.

**B. Adding 3-Digit Numbers Without Exchanging (Renaming)**
This involves adding two numbers where the sum of the units, tens, and hundreds columns are all 9 or less.
* **Method:**
1. Arrange the numbers vertically, aligning the units, tens, and hundreds digits.
2. Add the digits in the units column first.
3. Add the digits in the tens column.
4. Add the digits in the hundreds column.

* **Worked Example 2:** A school library has 125 storybooks and 213 textbooks. How many books are in the library in total?
* **Step 1:** Arrange vertically.
```
H T U
1 2 5
+ 2 1 3
-------
```
* **Step 2:** Add the Units column (5 + 3 = 8). Write 8 under the Units column.
```
H T U
1 2 5
+ 2 1 3
-------
8
```
* **Step 3:** Add the Tens column (2 + 1 = 3). Write 3 under the Tens column.
```
H T U
1 2 5
+ 2 1 3
-------
3 8
```
* **Step 4:** Add the Hundreds column (1 + 2 = 3). Write 3 under the Hundreds column.
```
H T U
1 2 5
+ 2 1 3
-------
3 3 8
```
* **Answer:** There are 338 books in total.

**C. Adding 2-Digit Numbers With Exchanging (Renaming / Carrying Over)**
This involves adding two numbers where the sum of the units column is 10 or more. The 'extra' ten

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