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To solve this problem, we need to determine which expression correctly converts 22 Australian dollars (AUD) to US dollars (USD) given the conversion rate.

**Conversion rate given:**
1.2 AUD = 1 USD

We want to find the expression that converts 22 AUD to USD. 

To convert AUD to USD, we use the conversion factor where 1 USD = 1.2 AUD. Thus, to find out how many USD are equivalent to a given number of AUD, we divide the number of AUD by 1.2:

\[
\text{USD} = \frac{\text{AUD}}{1.2}
\]

Substituting the given value:

\[
\text{USD} = \frac{22 \, \text{AUD}}{1.2}
\]

Now, let's look at the answer choices:

1. \(1.20 \, \text{AUD} \times \frac{1.2 \, \text{USD}}{1 \, \text{AUD}}\)
2. \(22 \, \text{AUD} \times \frac{1.2 \, \text{USD}}{1 \, \text{AUD}}\)
3. \(1.20 \, \text{AUD} \times \frac{1 \, \text{USD}}{1.2 \, \text{AUD}}\)
4. \(22 \, \text{AUD} \times \frac{1 \, \text{USD}}{1.2 \, \text{AUD}}\)

The correct expression will be the one that multiplies 22 AUD by the conversion factor that converts AUD to USD. Since \( \frac{1 \, \text{USD}}{1.2 \, \text{AUD}} \) is the correct conversion factor to go from AUD to USD:

The correct answer is **Choice 4**: 

\[
22 \, \text{AUD} \times \frac{1 \, \text{USD}}{1.2 \, \text{AUD}}
\]

### Would you like further details on this problem or have any questions?

Here are 5 related questions to consider:

1. How would you convert from USD to AUD if the conversion rate were different?
2. What is the equivalent of 50 AUD in USD using the same conversion rate?
3. If the conversion rate changes to 1.5 AUD = 1 USD, how would that affect the conversion expression?
4. How would you express the conversion from AUD to another currency, such as Euros, given a different exchange rate?
5. What would the conversion expression look like if you wanted to convert a variable amount of AUD to USD?

**Tip:** Remember to always check the direction of conversion when using exchange rates—whether you need to multiply or divide depending on the given rate!

Which expression can be used to convert 22 Australian dollars to US dollars? Assume 1.2 Australian dollars equals 1 US dollar.

Discover how to convert 22 Australian dollars to US dollars using the conversion rate of 1.2 AUD = 1 USD. This problem explains key concepts in currency conversion, including the necessary mathematical operations for students in Grades 6-8.

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