Nigeria - Primary 1 - General Mathematics - Addition I

Nigeria - Primary 1 - General Mathematics - Addition I

Lessonotes Nigeria curriculum lesson video for Primary 1 General Mathematics. This lesson focuses on Addition I for classroom teaching, revision, and home learning.

Country: Nigeria
Grade: Primary 1
Subject: General Mathematics
Scheme: Lessonotes Curriculum
Theme: Basic Operations
Period: Term 1
Week: 7

Performance Objectives
1. add two whole numbers from 1 to 3 with sum less than 5;
2. add two or three whole numbers from 1 to 8 with sum not up to 10;
3. add two or three numbers from 0 to 9 with sum not greater than 18;
4. add 2-digit whole numbers with sum not greater than 40 with out exchanging or renaming;
5. cross check numeracy in addition is readable.

Lesson Content
Grade / Level: Primary 1
Subject: General Mathematics
Theme: Basic Operations
Topic: Addition I
Term: 1st Term
Week: 7

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### 1. Overview and Learning Objectives

This topic, "Addition I," introduces Primary 1 learners to the fundamental concept of combining quantities. Addition is a core mathematical operation essential for daily living and forms the basis for more complex arithmetic. In the Nigerian context, understanding addition is crucial for learners to perform simple transactions, count resources (e.g., agricultural produce, livestock), manage personal belongings, and participate in communal activities requiring counting and combining.

Upon completion of this lesson, students will be able to:
* Combine two small groups of items (from 1 to 3) to find a total that is less than 5.
* Join two or three groups of items (from 1 to 8 in each group) to find a total that is less than 10.
* Add two or three numbers (ranging from 0 to 9) to get a sum not exceeding 18.
* Add two-digit numbers (e.g., 10 + 20) without needing to carry over numbers, to obtain a total not greater than 40.
* Write their addition answers clearly and check their work to ensure accuracy and readability.

These objectives directly apply to real-world Nigerian scenarios such as:
* Counting kola nuts or oranges at the market.
* Adding the number of siblings or playmates.
* Calculating the total number of items collected for a community project.
* Combining amounts of Naira notes for simple purchases.
* Ensuring accuracy when recording scores in local games.

### 2. Key Concepts and Explanations

**2.1 Definition of Addition:**
Addition is the process of combining two or more numbers or quantities to find their total or sum. It answers the question, "How many in all?" or "How many altogether?"

**2.2 Symbols Used in Addition:**
* **'+' (Plus sign):** This symbol means "add" or "combine with." For example, 2 + 3 means "2 combined with 3."
* **'=' (Equals sign):** This symbol means "is equal to" or "gives a total of." For example, 2 + 3 = 5 means "2 combined with 3 is equal to 5."

**2.3 Understanding Whole Numbers:**
Whole numbers are 0, 1, 2, 3, 4, 5, and so on. They are the counting numbers including zero.

**2.4 Strategies for Addition (Concrete and Pictorial):**
* **Counting All:** Students count every item from two separate groups after they are combined.
* **Counting On:** Students start counting from the larger number and count forward the number of items in the second group.
* **Using Manipulatives:** Concrete objects like fingers, toes, pebbles, bottle tops, seeds (e.g., _achi_ or _ogiri_ seeds), counting sticks, or beads are essential tools.
* **Number Line:** A visual representation where numbers are placed at equal intervals. Addition involves moving to the right on the number line.

**2.5 Step-by-Step Addition Examples:**

**Objective 1: Adding two whole numbers from 1 to 3 with sum less than 5.**
* **Concept:** Simple combinations of very small numbers.
* **Example 1:** 2 + 1 = ?
* **Method 1 (Using objects):** Gather 2 bottle tops. Then gather 1 more bottle top. Count all the bottle tops: 1, 2, 3. So, 2 + 1 = 3.
* **Method 2 (Counting on):** Start from 2. Count on 1 more: 3. So, 2 + 1 = 3.
* **Example 2 (Nigerian Context):** A child has 3 oranges. His mother gives him 1 more orange. How many oranges does he have now?
* Start with 3 oranges. Add 1 more orange. Count: 1, 2, 3, 4. Answer: 4 oranges. (3 + 1 = 4).

**Objective 2: Adding two or three whole numbers from 1 to 8 with sum not up to 10.**
* **Concept:** Slightly larger combinations, still manageable with fingers or few objects.
* **Example 1:** 4 + 3 = ?
* **Method (Counting on):** Start from 4. Count on 3 more: 5, 6, 7. So, 4 + 3 = 7.
* **Example 2:** 2 + 5 + 1 = ?
* **Method (Using objects/Counting on):** Take 2 pebbles. Take 5 pebbles. Take 1 pebble. Combine them all. Count all: 1, 2, 3, 4, 5, 6, 7, 8. So, 2 + 5 + 1 = 8.
* **Example 3 (Nigerian Context):** A boy caught 6 fish. His sister caught 3 fish. How many fish did they catch altogether?
* Start with 6. Count on 3: 7, 8, 9. Answer: 9 fish. (6 + 3 = 9).

**Objective 3: Adding two or three numbers from 0 to 9 with sum not greater than 18.**
* **Concept:** Involves numbers up to 9,

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