please post the other answers if you get them, this is pretty annoying
Hi everyone.
This is a puzzle that has been given to one of my tutoring students as an assignment. I'm supposed to help him out with it today and I'd like to know all the answers before I see him. Problem is I'm missing a few answers. Anyone like to pitch in?
Using 4 6's and operations (+-*/()) can you make calculations that add up to all the number from 1 - 9. Here are some examples.
66/66 = 1
6/6 +6/6 = 2
.
.
.
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6/.6 - 6/6 = 9
And now, can you also do the same for 4 7's, 4 8's and 4 9's.
I've got most of them out but i'm just stuck on a couple. I'd really appreciate if someone could work out and send, either in this thread or via PM's the answers to the following.....
6's = 8
7's = 4
8's = 4 & 5
9's = 4, 5 & 6
Thanks for your time
You think you're annoyed, I've been puzzling over this for ages and it's doing my head in. I hope there is an answer and this kids teacher isn't just trying to be funny.
I worked out a couple using square roots, but they weren't suggested as operations in the original question.
I fully agree with everything you have said except the words "like this". I'm all for puzzles but I fail to see how this particular one, for which blind trial and error is the only way, could stimulate creativity. In my opinion it risks dulling it just as much. This problem has nothing to do with mathematical reasoning.
The only thing I could see this as being useful for is getting better with the "priority of operations".
Havva look here, Bruno:
http://www.math.niu.edu/~rusin/uses-.../krypto/4fours