SMART Notebook 8.0Oct 14 - 19:28Use each of the numbers 1 - 10.Put one number in each circle.As you go down the rows, make each number the difference of the two numbers above it. How many different ways can it bedone?More differences107316The digit disks are not fixed to allow for modelling suggestions.12345678910Dec 4 - 11:43For the solution and other brainteaser ideas go to www.tes.co.uk/teacher/brainteasers/index.asp