Ratio, proportion and rates of change: change freely between related standard units (e.g. time, length, area, volume/capacity, mass) and compound units (e.g. speed, rates of pay, prices, density, pressure) in numerical and algebraic contexts(Pearson Edexcel GCSE)

Mastery Mind: Mathematics Revision · Oct 20, 2026 · 5m

The same journey can be described as 15 m/s or 54 km/h, and knowing why can protect several exam marks. Master standard units, squared and cubed factors, and compound rates so that speed, shopping, wages, density and pressure questions become a sequence of reliable decisions rather than guesses. Listen to this audio revision guide for Ratio, proportion and rates of change: change freely between related standard units (e.g. time, length, area, volume/capacity, mass) and compound units (e.g. speed, rates of pay, prices, density, pressure) in numerical and algebraic contexts. Test your knowledge…