Mastering Mathematical Reasoning · 6th-class

Active learning ideas

Understanding Value for Money and Best Buys

Active learning helps students grasp value for money because it makes abstract unit price calculations concrete. Handling real packages, flyers, and role-play scenarios turns what could feel like dry math into a tangible comparison task. Students connect calculations to decisions they see their families make daily.

• NCCA Curriculum Specifications
• NCCA: Primary - Money
• NCCA: Primary - Problem Solving

• 30–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 30 min · Pairs

Supermarket Sort: Unit Price Challenge

Provide identical products in different pack sizes with prices. Pairs calculate unit prices using calculators or by hand, then rank options from best to worst value. Discuss results as a class, noting patterns in findings.

How can we compare different offers to find the best value?

Facilitation Tip

During Supermarket Sort, provide identical products in different sizes and ask groups to arrange them by unit price before revealing the correct order.

What to look for

Provide students with three different sizes of the same product (e.g., juice cartons) with their prices. Ask them to calculate the unit price for each and circle the best buy. 'Which carton is the best value, and why?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 02

• Simulation Game
• 45 min · Small Groups

Flyer Hunt: Best Buy Scavenger

Distribute real supermarket flyers. Small groups identify three similar items, compute unit prices, and select the best buy with justification. Present choices to the class for peer voting and feedback.

What factors should we consider when deciding what to buy?

Facilitation Tip

In Flyer Hunt, limit each pair to three flyers so they must prioritize comparisons rather than collect every example.

What to look for

Present students with a scenario: 'A shop is offering a small bag of sweets for €1 or a large bag for €2.50. The small bag has 50 sweets, and the large bag has 150 sweets.' Ask: 'Is the large bag always the best buy? What else might you consider besides the number of sweets?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 40 min · Pairs

Role-Play Shop: Deal Debate

Set up a mock shop with priced items showing promotions. Pairs act as customers debating best buys with 'shopkeepers' from other pairs. Rotate roles, then debrief on persuasion tactics used.

How do shops try to encourage us to buy their products?

Facilitation Tip

In Role-Play Shop, assign one student as the shopkeeper to explain offers while the other calculates, making the negotiation visible.

What to look for

Give students a flyer with a 'buy one get one free' offer and a similar product sold individually. Ask them to calculate the effective price per item for the 'buy one get one free' offer and compare it to the individual item price. 'Was the BOGO offer a good deal?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 35 min · Whole Class

Budget Buy: Class Challenge

Give a fixed budget for a shopping list of essentials. Whole class votes on best buy options after individual calculations, tracking total savings as a group.

How can we compare different offers to find the best value?

What to look for

Provide students with three different sizes of the same product (e.g., juice cartons) with their prices. Ask them to calculate the unit price for each and circle the best buy. 'Which carton is the best value, and why?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Teach unit price by starting with visible quantities students can see or feel, like grams on a cereal box or millilitres on a bottle. Avoid jumping straight to formulas; instead, let students invent their own ways to compare before introducing division. Research shows this process builds stronger proportional reasoning. Keep discussions focused on 'why' behind calculations to prevent rote answers.

Students will confidently compare total costs and unit prices to identify best buys. They will justify choices using data, not assumptions, and explain how promotions affect value. Collaboration and discussion will reveal their evolving understanding through peer feedback.

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Watch Out for These Misconceptions

• During Supermarket Sort, watch for students who circle the lowest total price without checking the weight or volume.

  Ask them to hold the packages side-by-side and calculate price per gram together. Use the sorting mat to place packages in order from lowest to highest unit price, forcing them to confront the mismatch.

• During Supermarket Sort, watch for students who assume the largest package is always the best value.

  Give them a package with a high unit price but large size. Have them weigh it, calculate, and compare to a smaller package. Use the discussion to highlight why size alone doesn’t guarantee value.

• During Role-Play Shop, watch for students who accept 'buy one get one free' without calculating the unit price.

  Pause the role-play and ask the pair to calculate the price per item for the BOGO deal and compare it to the single-item price. Use the calculator at the station to make it immediate and visible.

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Methods used in this brief

• Simulation Game