Your number is...

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem

Your Number Is... printable worksheet



Press the button in the interactivity below, and see what happens:

Now try again starting with a different number.

Try again.

Try starting with a fraction... or decimal... or negative number...

Why are your answers ALWAYS the same?



Can you design instructions for similar "Think of a number" machines of your own?

Test them on a partner to check that they lead to your anticipated solutions.
 
 
You may want to take a look at Your Number Was... for a suitable follow-up activity.