To divide \(9.12\) by \(0.4\), you can use the following steps:

1. **Convert the division to a simpler form:**  
   Dividing by a decimal can be tricky, so let's convert it to a division by a whole number. To do this, multiply both the dividend (9.12) and the divisor (0.4) by 10 to eliminate the decimal points:
   \[
   \frac{9.12 \times 10}{0.4 \times 10} = \frac{91.2}{4}
   \]

2. **Perform the division:**  
   Now, divide \(91.2\) by \(4\):
   \[
   91.2 \div 4 = 22.8
   \]

So, \(9.12 \div 0.4 = 22.8\).

### Answer:
\[
9.12 \div 0.4 = 22.8
\]

Would you like to see more details on how I performed this division, or do you have any other questions? 

Here are 5 related questions you might find helpful:
1. How do you multiply decimals?
2. What is the process for dividing numbers when the divisor is a decimal?
3. How do you convert a decimal to a fraction and vice versa?
4. What are some common mistakes when dividing decimals?
5. How can you check if your division of decimals is correct?

**Tip:** When dividing by a decimal, always try to convert the divisor to a whole number to make the division simpler.

Learn how to divide 9.12 by 0.4 with a clear step-by-step solution. This problem covers essential arithmetic concepts, including the division of decimals and multiplication for simplifying division. Perfect for students in Grades 5-7.

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