Based on your search query, I recommend using Wolfram Alpha. This computational knowledge engine can provide direct answers to factual queries, making it a reliable tool for teaching about Australian currency to your grade 3 students.

Here's how Wolfram Alpha can help:

• Real-world data: Wolfram Alpha offers real-world data, which can be used to provide current and relevant information about Australian currency. This feature can help students understand the value and significance of different Australian coins and notes.

• Educational resources: The platform offers a range of educational resources that can be used to create engaging lessons about Australian currency. You can use these resources to explain the history and evolution of Australian currency, and how it compares to other currencies.

• Problem Generator: This feature can be used to create practice problems related to Australian currency. For example, you can generate problems that require students to convert between Australian dollars and cents, or to calculate the total value of a set of coins and notes.

Remember, Wolfram Alpha is a versatile tool that can be used across various subjects and topics. So, while it can be a great resource for teaching about Australian currency, it can also be used to support other areas of your curriculum.