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Equation

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Equation - Back to the Number Puzzles

Rectify the following equality 101 - 102 = 1 by moving just one digit.

This old topic is locked since it was answered many times. You can check solution in the Spoiler below.

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Equation - solution

Move the numeral 2 half a line up to achieve 101 - 102 = 1.

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Posted · Report post

Ha! That was great!

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Posted · Report post

this is what i thought:

move '1' to the other side of the equation so nothing is left on the right hand side (ie. 0!)

so u get:

101-102+1 = 0

hows that!

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Posted · Report post

I believe that you could not add a numeral eg. 101-102=1 has 4-1s 1-2s 2-0s and yours has 3-0s.

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Posted · Report post

this is what i thought:

move '1' to the other side of the equation so nothing is left on the right hand side (ie. 0!)

so u get:

101-102+1 = 0

hows that!

that requires adding a '+' sign, which wouldn't be right.

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Posted · Report post

What about 101 - 10 = 21 (in base 3)

You would count 0, 1, 2, 10, 11, 12, 20, 21, 22, 100, 101 etc...

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Posted · Report post

How about this

Take the top half of the equal sign and move it over the top of the minus sign.

101 = 102 - 1.

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Posted · Report post

How about this

Take the top half of the equal sign and move it over the top of the minus sign.

101 = 102 - 1.

that would also work. but that wouldn't be moving a numeral

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Posted · Report post

I thought that but realised it wasn' "moving a numeral." It took me longer to find the answers - your puzzles are great!

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Motto: 'To Start Press Any Key'. Where's the ANY key? - Homer Simpson

Back in the old days, very old days - 8 bit processors, 5-1/4 floppies and dreams of hard drives - I met a man whose business it was to provide telephone support for the users of his client's software. He told me that the most commonly asked question was "Where is the any key?" It wasn't long before software publishers went to "Press the space bar to continue."

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Posted · Report post

move(interchange) 1 and 2 of "101 - 102 = 1" to give u:

102-101=1

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Posted · Report post

how about moving the one from 101 over the equal

10 - 102 ? 1

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Posted · Report post

how about moving the one from 101 over the equal

10 - 102 ? 1

U beat me to it...great answer!

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Posted · Report post

101 - 102= -1 not positive 1

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Some of these problems are not at all clear. I spent a long time with this one without an answer becuase it was not mentioned in the instructinos that you can add or remove mathematical opperators.

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Posted · Report post

Lol, i was thinking really hard about this and it hit me like a load of bricks. 101 - 102 = 1

Change to 102 - 102 = 0 wouldnt that work. I think i over thought that.

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Posted · Report post

could you move 101 and switch it with 102

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101 - 102= -1 not positive 1

yes, but that isn't what the riddle is about.

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Equation - Back to the Number Puzzles

In the following "equation" 101 - 102 = 1 move one numeral, in order to rectify it.

Equation - solution

Move the numeral 2 half a line up to achieve 101 - 102 = 1.

that was genius!

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Posted (edited) · Report post

last i recall 101-102 is not 1 but -1, and that is the err that needs to be rectified

Edited by dbriti
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Posted · Report post

Back in the old days, very old days - 8 bit processors, 5-1/4 floppies and dreams of hard drives - I met a man whose business it was to provide telephone support for the users of his client's software. He told me that the most commonly asked question was "Where is the any key?" It wasn't long before software publishers went to "Press the space bar to continue."

I met a man whose business it was to provide telephone support too. His customers were very upset that it took 3-5 days to get help, but they had a working phone when he was done.

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Posted · Report post

last i recall 101-102 is not 1 but -1, and that is the err that needs to be rectified

the instructions were to change one numeral so that the equation would be true. if u looked at the answer, he changed that numeral and therefore his answer is correct

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Posted · Report post

good 1

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you could also move the line above the equals sign

101-102=1 ===> 101=102-1

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101 = 102 - 1

this seems to be more straight forward rather than the square of 10 solution.. ;)

move the - from the rhs to lhs sign

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