MathematicsExam code: 0580
Compound Measures
Number
Rates in everyday contexts
- The same structure covers a wide range of contexts named by the specification
| Rate | Calculated as |
|---|---|
| Hourly pay | total pay ÷ hours worked |
| Exchange rate | amount in one currency ÷ amount in the other |
| Flow rate | volume ÷ time |
| Fuel consumption | fuel used ÷ distance travelled |
| Population density | population ÷ area |
- Each is handled by dividing, then attaching units built from the two quantities
- A tank taking 25 minutes to receive 4500 litres has a flow rate of 180 litres per minute
- A region of 800 km² holding 2.4 million people has a population density of 3000 people per km²