A puzzle and a call for help.

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