The focus of this activity to challenge students to apply their knowledge of the four operations to solve a problem involving money. Students also need to demonstrate their ability to explain using evidence which option is the best.

##### Purpose

- Estimate solutions to problems
- Use the four operations and brackets to record a number sentence
- Apply knowledge of addition and subtraction to solve problems involving money
- Multiply decimals (money) by whole numbers
- Perform divisions of whole numbers where the result is a decimal
- Use calculations to compare options and explain which one is the best and why
- Show the strategy used to solve the problem
- Explain the strategy used to find a possible solution
- Check the solution to a problem using a model, visual method or calculations

##### Curriculum Connections: NSW SYLLABUS K-10 – STAGE 3

##### WHOLE NUMBERS 1

- Recognise, represent and order numbers to at least tens of millions

##### ADDITION & SUBTRACTION 1

- Use efficient mental and written strategies and apply appropriate digital technologies to solve problems (ACMNA291)

##### ADDITION & SUBTRACTION 2

- Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving addition and subtraction with whole numbers (ACMNA123)

##### FRACTIONS & DECIMALS 2

- Solve word problems involving the addition and subtraction of decimals, with and without the use of digital technologies, including those involving money
- Multiply decimals by whole numbers and perform divisions by non-zero whole numbers where the results are terminating decimals, with and without the use of digital technologies (ACMNA129)
- Compare, order, add and subtract integers (ACMNA280)

##### At the end of this lesson students should be able to answer the following questions

- How can we represent this problem?
- Which option do you think is better? Why?
- What strategy can you use to find a solution?
- Is there a more effective strategy?
- How can you check that your strategy is correct?
- Is there another method that could be used to find a solution to this problem?
- Could digital technology help? A calculator or a spreadsheet
- Can you use what you have discovered to explain which solution is better and why?

*For more information, please download the attached lesson plan*.

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