+0
Five of them can be used at the most.
At most 5 of them can be used.

Are they correct and do they carry the same meaning?
Thanks.
+0
LiveinjapanAre they correct and do they carry the same meaning?
Yes, as far as the grammar of those sentences is concerned, but I'd say "No more than five (of them) can be used".

CJ
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
CalifJim"No more than five (of them) can be used"
I've never come up with that! Thanks so much, CJ.
LiveinjapanThanks so much, CJ.
You're welcome.

Note this, however. I think this is what you intended to say.

I would never have come up with that!

CJ
CalifJimI would never have come up with that!
Yes, that's what I wanted to sayEmotion: big smile. I actually felt my sentence was a bit odd. Thanks, CJ.
Site Hint: Check out our list of pronunciation videos.