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Topic: the magical 6174
Replies: 2   Last Post: Dec 7, 2001 3:53 PM

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Mathias Stewart

Posts: 1
Registered: 12/3/04
the magical 6174
Posted: Dec 7, 2001 3:15 PM
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I've had my grade 9's looking at this over the past week. For the
numbers they found, that would need seven subtractions, it turned out
that the two largest always had a difference of 1, and the two
smallest digits had a difference of two. It doesn't work throughout,
but I was excited that theyfound that.
The reason for the posting is that I was wondering if there is any
good proof for it being impossible to go beyond 7 subtractions.

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