On Friday I posted this puzzle….

Can you move one numeral and make the following equation correct?


If you have not tried to solve it, have a go now.  For everyone else, the answer is after the break.

Move the ‘2’ vertically…..



Did you solve it?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UKhere and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.


    1. You didn’t solve it! The question was: Can you move one NUMERAL and make the following equation correct?

    1. the fact that richard specifically used arabic numbers here clued me that this puzzle had something to do with moving the digits around.

      it helped that i have a kid who is very into powers right now.

  1. I got the original one, but like the base 3 version better. It’s also very cool that 21 has the same value in decimal as well as base 3.

    1. Let’s see…
      21 in base 3 = 7 in base 10.
      21.0 in base 10 = 210 in base 3.
      BTW did you know you can have fractional base number systems.
      And yes, Dave, I’m probably a real blast at parties.

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