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25. Ratio, proportion and rates of change

Identifying good value for money when shopping online

Pupils apply their arithmetic skills to work out how best to save money during a weekly grocery shop.

Scenario

To save time, your parents repeat the same online food shop each week at the same supermarket. During a recent family discussion about the increases in cost of living, you suggested that they could bulk buy staple items and you could help them to shop around for better value options.

Curriculum references

National Curriculum 11 Use compound units such as speed, rates of pay, unit pricing, density and pressure.
OCR 10.01b Use and convert simple compound units (eg for speed, rates of pay, unit pricing). Know and apply in simple cases: speed = distance ÷ time. Use and convert other compound units (e.g. density, pressure). Know and apply: density = mass ÷ volume.
AQA Edexcel R11 Use compound units such as speed, rates of pay, unit pricing. Use compound units such as density and pressure.