Which of the following number is not divisible by 4? 324, 116, 288, 132, 138

To determine which of the given numbers is **not divisible by 4**, we can use a simple rule: A number is divisible by 4 if the number formed by its last two digits is divisible by 4.

Let's check each number:

1. **324**: Last two digits are **24**.
   - \( 24 \div 4 = 6 \) (Divisible by 4)
   
2. **116**: Last two digits are **16**.
   - \( 16 \div 4 = 4 \) (Divisible by 4)
   
3. **288**: Last two digits are **88**.
   - \( 88 \div 4 = 22 \) (Divisible by 4)
   
4. **132**: Last two digits are **32**.
   - \( 32 \div 4 = 8 \) (Divisible by 4)
   
5. **138**: Last two digits are **38**.
   - \( 38 \div 4 = 9.5 \) (Not divisible by 4)

### Answer:
The number **138** is **not divisible by 4**.

Do you have any further questions or need more details?

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Here are some related questions:

1. How can you determine if a number is divisible by 8?
2. What are the divisibility rules for 3 and 9?
3. Why is divisibility by 4 based on the last two digits of a number?
4. How can you quickly check for divisibility by 6?
5. What is the significance of divisibility rules in simplifying fractions?
6. Can a number divisible by 8 always be divisible by 4?
7. How can you determine if a number is divisible by 2?
8. What are some practical applications of divisibility rules?

**Tip:** Remember, divisibility rules are shortcuts that can save you a lot of time when working with numbers, especially on standardized tests or quick checks.

Learn how to identify which of the numbers 324, 116, 288, 132, and 138 is not divisible by 4. Understand the rule of divisibility by 4 based on the last two digits. Suitable for students in Grades 4-6.

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