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 Post subject: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 8:32 am

Joined: Tue Apr 03, 2012 11:50 pm
Location: Seoul, Korea
Ah... Let me see...
Thirteen minus seventy-one equals to four.
Am I right?

Yes.

Attachment:

Matches.png [ 4.78 KiB | Viewed 2680 times ]

(Edit:) What is the minimum number of matches which have to be moved to correct the equation?
Thanks, Gus!

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Last edited by Uiqoo on Tue May 01, 2012 4:56 pm, edited 1 time in total.

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 8:49 am

Joined: Wed Dec 14, 2011 12:25 pm
Location: Finland
Here's one solution, spoilered:
(Interpret it as |3-7|=4)

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 8:54 am

Joined: Sun Mar 15, 2009 12:00 am
Location: Jarrow, England
Perhaps the problem would be better stated as What is the minimum number of matches which have to be moved to correct the equation?

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 8:58 am

Joined: Tue Apr 03, 2012 11:50 pm
Location: Seoul, Korea
Coaster1235 wrote:
Here's one solution, spoilered:
(Interpret it as |3-7|=4)

Nice.

Gus wrote:
Perhaps the problem would be better stated as How many matches have you got to move to correct the equation?

Oh, That's a perfect idea. Surely better.

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 7:23 pm

Joined: Mon Aug 18, 2008 10:16 pm
Location: Somewhere Else
My answer: Just one! Put the minus sign over the equals sign to make not-equals. 1371 is not 4!

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 7:53 pm

Joined: Sun Mar 04, 2012 9:52 am
I heard another one similar to this today. Move exactly one digit in this equation to make it correct. 62 - 63 = 1

Callum

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 8:34 pm

Joined: Sat Apr 22, 2000 2:51 am
Location: New Ulm, Minnesota, USA
How can 3-7=4?

Wouldn't that be -4 for the answer. If you want to do it the right way it would be 71-13=4 then take away the 1's. Right?!?!

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 8:44 pm

Joined: Sun Oct 04, 2009 5:06 pm
Location: Ridgefield, Connecticut
Darren Grewe wrote:
How can 3-7=4?

Wouldn't that be -4 for the answer. If you want to do it the right way it would be 71-13=4 then take away the 1's. Right?!?!

If you're referring to coaster's solutions its the absolute value of 3-7, which is 4. |3-7| = |-4| = 4 . You also couldn't just remove the ones because it says you have to move the match sticks.

Ben

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 9:13 pm

Joined: Fri Mar 30, 2012 10:20 pm
My solution: I took the 1 from 71 and turned the 7 into a 9. The equation now reads:
13-9=4. Only 2 matchsticks moved!

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 9:43 pm

Joined: Fri Mar 09, 2012 3:43 am
My solution: 16-7=9 3 sticks moved

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 9:57 pm

Joined: Thu Nov 05, 2009 7:30 pm
Location: New York

2 matches
From
13-71=4
to
13-17=4

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Tue May 01, 2012 10:12 pm

Joined: Fri Mar 30, 2012 10:20 pm

2 matches
From
13-71=4
to
13-17=4

13-17= -4, not 4!

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PuzzleMaster6262 wrote:
rubixwiz031 wrote:
Have you ever pooped in public? If you have, what were your experiences?
No, I haven't tried that yet. Or would a bathroom stall count?

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Thu May 03, 2012 6:01 pm

Joined: Fri Jan 29, 2010 2:34 pm
Location: Scotland, UK
Yeah, I'm cheating too: 13-71=h, where h=-58. 1 matchstick moved.

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Thu May 03, 2012 6:16 pm

Joined: Sat Jan 16, 2010 11:48 am
Location: In Front Of My Teraminx (saying WTF?)
Callum wrote:
I heard another one similar to this today. Move exactly one digit in this equation to make it correct. 62 - 63 = 1

Callum

make the 6 on the top right of the 2 as to have 2 to the power of 6 :
_6
2-63=1

2^6-63=64-63=1

Is there another solution ?

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Thu May 03, 2012 8:03 pm

Joined: Sun Mar 04, 2012 9:52 am
RubixFreakGreg wrote:
Callum wrote:
I heard another one similar to this today. Move exactly one digit in this equation to make it correct. 62 - 63 = 1

Callum

make the 6 on the top right of the 2 as to have 2 to the power of 6 :
_6
2-63=1

2^6-63=64-63=1

Is there another solution ?

Correct! As far as I know there is no other solution (can someone prove me wrong?).

Callum

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Fri May 04, 2012 12:11 am

Joined: Tue Apr 03, 2012 11:50 pm
Location: Seoul, Korea
Callum wrote:
RubixFreakGreg wrote:
Callum wrote:
I heard another one similar to this today. Move exactly one digit in this equation to make it correct. 62 - 63 = 1

Callum

make the 6 on the top right of the 2 as to have 2 to the power of 6 :
_6
2-63=1

2^6-63=64-63=1

Is there another solution ?

Correct! As far as I know there is no other solution (can someone prove me wrong?).

Callum

That's may an only solution.
BTW, I just found interesting thing... Pretending like just that is in matches, I can move 1 match to correct the equation: 62-63=1.

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Fri May 04, 2012 12:22 am

Joined: Thu Dec 21, 2006 5:32 pm
Location: Bay Area, CA
Uiqoo wrote:
BTW, I just found interesting thing... Pretending like just that is in matches, I can move 1 match to correct the equation: 62-63=1.
Ah, nice. Solution: Move the bottom match of the '=' to the '-' to swap them: 62 = 63 - 1

Dave

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 Post subject: Re: The Best Simple Matchstick ProblemPosted: Fri May 04, 2012 3:26 am

Joined: Sat Jan 16, 2010 11:48 am
Location: In Front Of My Teraminx (saying WTF?)
Good job Dave ! I had though of something with the signs and all, but this never crossed my mind !

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