Function Machines
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Here is a number machine.

Input→[×4]→[+7]→Output \text{Input} \rightarrow [\times 4] \rightarrow [+ 7] \rightarrow \text{Output} Input→[×4]→[+7]→Output
a.

Find the output when the input is 6.

[1]
b.

Find the input when the output is 15.

[2]

Function Machines Questions

Practise AQA GCSE Maths Function Machines with exam-style questions for Foundation and Higher tier. 39 questions, matched to the AQA GCSE Maths (8300) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Function Machines Questions

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