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Function Machines

Function Machines

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Question 18

A computer uses a rule to process numbers as shown in the diagram below.

Number machine diagram

The rule is: multiply by 2, then add 9.

a.

Find the output when the input is 11.

[1]
b.

Find the input when the output is 21.

[2]
Markscheme

Function Machines Questions

  1. GCSE
  2. /Maths
  3. /Function Machines

84 exam-style questions on OCR GCSE Maths Function Machines. Each one has a worked solution and a mark scheme showing where the marks go.

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