Caleb thinks of a number. "If I double my number and add 5 the answer is 23"
Cameron thinks of a number. "If I multiply my number by 4 and add 3 the answer is 79"
Carlos thinks of a number. "If I add 3 to my number then divide the result by 2, the answer is 7"
Caroline thinks of a number. "If I multiply my number by 6 and subtract 5 then multiply the result by 6, the answer is 6 less than 552"
What numbers are they thinking about?
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Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments:
However it would be better to assign one of the student interactive activities below.
Here is the URL which will take them to a related student activity.
See the National Curriculum page for links to related online activities and resources.