# Maths KS3 / GCSE: Ratio and Proportion

**This short clip demonstrates how ratios are used in everyday life by cooks to make recipes - dividing an amount into given parts.**

The video clip shows a cake company that needs to deliver an order within a specified time frame.

The clip looks at increasing ingredients in direct proportion, and deciding how many workers need to be hired to complete the order in 2 hours.

This is from the series: Real Life Maths

*Teacher Notes*

*The video could be used as real life examples of how ratio and inverse proportion calculations can be used to solve problems.*

*It follows a step-to-step guide using graphics and visuals to support calculations to reinforce and enhance learning in the classroom.*

*Learners in pairs or groups of no more than 3 students choose to open a company (teacher could give the students a list of companies to choose from).*

*They investigate ratio and proportion, such as staffing, delivering orders on time, profitability, Economic growth and mathematical justification such as increase in productivity, and the effect on company turn over.*

*The results and findings can be represented in a presentation using ICT.*

*Students could investigate stand-alone projects in finding how Nurses calculate proportional dosage to patients and how they use ratio/proportion.*

*How ratio and proportion are used in the banking world or Biologists and ecologists.*

*Students can also use the Internet to investigate ‘proportional’ representation and the electoral system.*

*Curriculum Notes*

*This clip will be relevant for teaching Maths at KS3/GCSE in England Wales and Northern Ireland. Also at National 4, 5 and Higher in Scotland.*

*This topic appears in OCR, Edexcel, AQA, WJEC in England and Wales, CCEA GCSE in Northern Ireland and SQA in Scotland.*