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 Post subject: The Best Simple Matchstick Problem
PostPosted: Tue May 01, 2012 8:32 am 
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Location: Seoul, Korea
Ah... Let me see...
Thirteen minus seventy-one equals to four.
Am I right?




Yes.





Attachment:
Matches.png
Matches.png [ 4.78 KiB | Viewed 2962 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 Problem
PostPosted: Tue May 01, 2012 8:49 am 
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Here's one solution, spoilered:
(Interpret it as |3-7|=4)

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 Post subject: Re: The Best Simple Matchstick Problem
PostPosted: Tue May 01, 2012 8:54 am 
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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 Problem
PostPosted: Tue May 01, 2012 8:58 am 
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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 Problem
PostPosted: Tue May 01, 2012 7:23 pm 
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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 Problem
PostPosted: Tue May 01, 2012 7:53 pm 
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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 Problem
PostPosted: Tue May 01, 2012 8:34 pm 
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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 Problem
PostPosted: Tue May 01, 2012 8:44 pm 
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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 Problem
PostPosted: Tue May 01, 2012 9:13 pm 
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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 Problem
PostPosted: Tue May 01, 2012 9:43 pm 
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My solution: 16-7=9 3 sticks moved


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

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

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 Post subject: Re: The Best Simple Matchstick Problem
PostPosted: Tue May 01, 2012 10:12 pm 
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MizMelysaLadi wrote:
Answer:

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


13-17= -4, not 4!

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 Post subject: Re: The Best Simple Matchstick Problem
PostPosted: Thu May 03, 2012 6:01 pm 
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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 Problem
PostPosted: Thu May 03, 2012 6:16 pm 
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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 Problem
PostPosted: Thu May 03, 2012 8:03 pm 
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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 Problem
PostPosted: Fri May 04, 2012 12:11 am 
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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 Problem
PostPosted: Fri May 04, 2012 12:22 am 
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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 Problem
PostPosted: Fri May 04, 2012 3:26 am 
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Good job Dave ! I had though of something with the signs and all, but this never crossed my mind !

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