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You might like to play the factors and multiples game before attempting this investigation, which can be taken to many levels of complexity.
Write down a selection of positive whole numbers less than 100 in some positions of your choice on a large blank piece of paper.
Now, draw lines (not necessarily straight) which join each number in the selection with all of the factors and multiples of the number in the selection.
For your selection and arrangement of numbers, can you draw lines so that none cross?