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Arrange the digits 1 to 6 on the circles to make the statement correct:
Clue 1 Clue 2 Clue 3 Level 2 Level 3
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Topics: Starter  Arithmetic  Problem Solving
Transum maths fun in Yr 6! #BackToSchool pic.twitter.com/32q8uh2gHo
— JESS Jumeirah Year 6 (@JESS_JJ_YR6) August 31, 2016
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Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=September3
Here is the URL which will take them to a selfchecking version of Digivide.
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Is it possible to arrange the digits 3 to 8 on the circles to make the statement correct?
The puzzle above is impossible but it will take a good mathematician to prove it is so!
The extension task is to get as close as possible to a correct statement. What is the minimum amount of error you can achieve (you will first need to define how you measure error).