Here is a number machine.

What is the output when the input is 7?
Here is a different number machine.
[Figure 2: A number machine diagram showing Input entering a box labeled '+11', which then enters a box with '.....', resulting in Output.]
When the input is 9 the output is 2.
The missing box must contain one of the operations +10, -10, ×10 \times 10\,×10 or ÷10\div 10÷10.
Complete the number machine.
84 exam-style questions on AQA GCSE Maths Function Machines. Each one has a worked solution and a mark scheme showing where the marks go.