This is based on a UK Mathematics Trust activity from the Team Maths Challenge.
Draw an input/output table on the board. Choose a function, but don't disclose it!
Fill in several non-consecutive 'input' numbers in the table. For one or two, write down the corresponding output (using your secret function).
Ask pupils for the output numbers, one input at a time. They should not disclose the rule. If they are correct, write it down and move on to the next input. If they get it wrong, ask the next student to have a go.
After several correct numbers, ask for the secret rule.
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