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Menacing Matchsticks V

Trick brain teasers appear difficult at first, but they have a trick that makes them really easy.


Puzzle ID:#35635
Fun:*** (2.45)
Difficulty:*** (2.63)
Submitted By:calmsaviorAus******




You will need thirteen matchsticks for this teaser. Using all of the matchsticks, make the number 631, as the number would appear digitally.

Now, as the fifth Menacing Matchsticks teaser, try to move only two matchsticks to make exactly 5!

You cannot:
Bend or break the matchsticks.
Stack the matchsticks.
Remove the matchsticks.

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Mar 10, 2007

i never would have gotten that. i knew that the "!" had something to do with it, but at teh risk of sounding like an idiot, i don't know what factoral is still, i had fun trying to do it though! very good
Mar 11, 2007

Lol, apparently I'm not thinking too well this morning. Factorial!

Great teaser!
Mar 14, 2007

Sorry, this one went right over my head because I could my 631 I only used 12 matchsticks to make. I too am having problems with factorial????
Mar 14, 2007

In mathematics, the factorial of a positive integer n is the product of all positive integers less than or equal to n. This is written as n! and pronounced "n factorial", or colloquially "n shriek", "n bang" or "n crit". The notation n! was introduced by Christian Kramp in 1808. I looked it up since I was so unsure of myself. No wonder I didn't know - this is definitely outside my data base. Never have been good with math, let alone integers. Sorry

Mar 14, 2007

vlerma, for the 1, you need 2 matchsticks (look at a digital clock). Was that your problem?

This was actually a really fun teaser, even though I didn't get the answer. It went into my favorites!
Mar 14, 2007

And I thought that i was the only one who knew what a factorial was. Very clever.
Mar 14, 2007

Cool, One of the best teasers I have ever seen on Braingle.

Definitely one of my favorites.
Mar 15, 2007

SO EASY....i dont know why its difficulty rating is so high....i got this one so quickly and im only 13! (and not 13 factorial)
Mar 23, 2007

That was another great matchstick teaser!
May 15, 2007

Funny, and hard!
May 16, 2007

Ignoring the factorial what if you moved the top and bottom of three to make the 3 a + and the 1 a -1 ?
May 18, 2007

wow i worked soooo hard... I knew ! was a hint but who could've guessed that it was for factorial... lost 13 sticks here lol
May 20, 2007

I knew it was factorial but I forgot what factorial was!
Jun 02, 2007

What's a factorial? It's June... How am I supposed to remember that?!?!?!?!?!?!?!?!?!?!?!?!
(user deleted)
Jun 12, 2007

If you space the numbers out far enough you can easily take apart the 1 and make the 6 an 8 and add a minus sign 8-3=5 simple
Oct 26, 2007

Wow, I found this really easy and really fun. I loved it. =D

Thank god for Algebra II.
Oct 19, 2008

Vlerma, factorial has next to nothing to do with integers. It only requires the knowledge of counting numbers. And Winner, I don't think the 1 matters much, since it stays the same. So, vlerma, using 12 matchsticks is a bad excuse for not getting it.
Aug 23, 2009

I know I'm over a year too late, but shouldn't this be in the Math section?
Aug 27, 2013

What on earth is a factorial?!

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