Paige thinks of a number. "If I double my number and add 4 the answer is 40"  Rachel thinks of a number. "If I multiply my number by 4 and add 2 the answer is 78"  
Rebecca thinks of a number. "If I add 4 to my number then divide the result by 2, the answer is 6"  Richard thinks of a number. "If I multiply my number by 3 and subtract 5 then multiply the result by 4, the answer is 2 less than 186" 
What numbers are they thinking about?
Topics: Starter  Algebra  Functions  Puzzles
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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: Transum.org/go/?Start=November1 However it would be better to assign one of the student interactive activities below. 

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See the National Curriculum page for links to related online activities and resources.