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If the R-value is above 1, then the number of cumulative cases increases rapidly, but if it is below 1, then eventually the outbreak stops. The further R is below 1, the faster that happens; it is referred to as bending the curve

• In accounting – to calculate the depreciation in value of physical assets. As a car gets older, its value decreases.

• In economics – to predict the effect of inflation on the cost of living (CPI is the Consumer Price Index).

2E Tasks and questions

Thinking task

1 Make a list of all the places that you see percentages in the world around you. Think of shopping, work and leisure. Find some examples of each and save images or take photos to illustrate the different percentages to share with the class.

Skills questions

2 Copy and complete the table to write the fractions as decimals and percentages.