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The Number Crunching Machine

Put a number at the top of the machine and collect a number at the bottom. What do you get? Which numbers get back to themselves?


Age 7 to 11
Challenge Level
Can you work out what is happening as you go through each "box" in this machine?
Some have been left blank for you to invent your own.


In these two examples, each box does something different.

Can you work out what it is?


Try putting some different start numbers in.

Can you predict what they will come out as?