Relate addition and subtraction

Relate addition and subtraction

Naveen Hegde

Last Update 7 เดือนที่แล้ว

Hello, students! Today, we are going to learn how addition and subtraction are related. Understanding this relationship helps us solve math problems more easily.

Relate Addition and Subtraction

Addition and subtraction are opposite operations. When we add, we combine numbers to find the total. When we subtract, we take away numbers to find out what is left. Let's explore how these operations are connected.

Understanding the Relationship

1. **Addition:**
- Addition means putting together two or more numbers.

**Example:**
- 3 + 2 = 5

2. **Subtraction:**
- Subtraction means taking away one number from another.

**Example:**
- 5 - 2 = 3

Notice how 5 is the total when we add 3 and 2. When we subtract 2 from 5, we get back to 3. This shows how addition and subtraction are connected.

Using Objects to Show the Relationship

1. **Using Blocks or Toys:**
- Let's use blocks to see how addition and subtraction work together.

**Example:**
- You have 4 blocks. You get 3 more blocks. Now you have 7 blocks.
- 4 + 3 = 7
- If you take away 3 blocks from 7, you have 4 blocks left.
- 7 - 3 = 4

2. **Using Fruits:**
- You have 6 apples. You get 2 more apples. Now you have 8 apples.
- 6 + 2 = 8
- If you take away 2 apples from 8, you have 6 apples left.
- 8 - 2 = 6

Writing Number Sentences

1. **Addition and Subtraction Sentences:**
- We can write number sentences to show how addition and subtraction are related.

**Example:**
- Addition: 3 + 4 = 7
- Subtraction: 7 - 4 = 3

2. **Finding Missing Numbers:**
- We can use the relationship between addition and subtraction to find missing numbers.

**Example:**
- If we know 5 + __ = 8, we can subtract to find the missing number.
- 8 - 5 = 3, so 5 + 3 = 8

Activities and Practice

1. **Using Objects:**
- Use 10 toy cars. Add 3 more toy cars to find the total. Then subtract 3 toy cars to find how many are left.

2. **Writing Number Sentences:**
- Write an addition sentence and a related subtraction sentence.

Worksheet:
1. 4 + 5 = __
9 - 5 = __

2. 6 + 2 = __
8 - 2 = __


Still need help? Message Us