CAIE IGCSE Mathematics Extended Exponential Growth and Decay

Practise modelling repeated percentage growth or decay, finding unknown rates and determining when a value first crosses a stated threshold.

Syllabus
2028–2030
Topic
E1.17
Level
Extended

Exam points

  • model repeated growth or decay as initial value × (1 ± rate ÷ 100)^time
  • rearrange the exponential model and take a root to determine an unknown periodic rate
  • test consecutive whole periods to identify when a population, value or mass first crosses a limit

Covered syllabus points

E1.17.1 Use exponential growth and decay

E1.17 Exponential growth and decay question 1

[Maximum number: 3]

The average attendance increased exponentially by 4% each year for the three years from 2016 to 2019.
In 2019 the average attendance was 1631.
Find the average attendance for 2016.

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