This fun activity is based on input and output machines. It is investigation and problem solving interactive resource to use as a starter or plenary. Three levels of difficulty are available. You can ask students to try some numbers or you can fill in some beforehand. To access the resource follow the link from the headline or visit @theeducatorslist (post: Discussion in maths).
Answers can be revealed by following the exclamation mark.
Perfect to use with the worksheet version:
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