Grandpa loves to make silly little statements. And he thinks they are riddles.

The other day he turned to me and said:

"This is not math but

Take a number

Add a number to it

And you are finished"

What is he talking about?


Take a number

D (500 in Roman numerals)

Add a number to it


And you are finished


  • $\begingroup$ Great.Too Fast @jafe. Here is one for you. Take a number add a number and you become an animal $\endgroup$ – DEEM Aug 24 '18 at 9:05
  • $\begingroup$ I have never heard of that number before... turns out Rot13(Y vf nyfb n ahzore; Y = 50) after doing a little bit of research. $(+1)$ :P $\endgroup$ – user477343 Aug 24 '18 at 9:19
  • $\begingroup$ Cv + T = cvt? (T orvat Pngnyna'f pbafgnag, nccebkvzngryl 0.916) $\endgroup$ – jafe Aug 24 '18 at 9:22
  • $\begingroup$ It was a trick question. C + AT = CAT Get it? $\endgroup$ – DEEM Aug 24 '18 at 9:47
  • $\begingroup$ Haha, I see. A...T... wouldn't have guessed that one :D $\endgroup$ – jafe Aug 24 '18 at 9:49

Alternative answer:

Adding 10 (X in Roman numerals) to Euler's number (e) means that you are finished with your Significant Other. (You are now an "ex").

Alternative alternative answer: (Aiming for the world record in the category of "the largest finite number used in a gratuitous wordplay")

Grandpa has confused addition with hexation. (Happens to the best of us from time to time).

Choosing a 3 as both of the numbers, we get $3 \uparrow \uparrow \uparrow \uparrow 3$ (in Knuth's notation), which can also be written as $g_1$, or "g-one".

Both "You are finished!" and "You are gone!" are serious threats on the health and life of the other person.

  • $\begingroup$ You should meet my Grandpa @Bass!! $\endgroup$ – DEEM Aug 24 '18 at 12:37

My answer is



D is a number in Roman. Add one and you are done

  • 1
    $\begingroup$ Hello! Welcome to the Puzzling Stack Exchange (Puzzling.SE)! Great answer... but unfortunately, @jafe's answer above has the exact same idea. Also, whenever you answer, ensure to hide the answer in a spoiler tag/quote >! in order to not spoil the answer for other users attempting to solve the puzzle! Consequently, I have proposed such an edit. And, since you are new, I strongly suggest you visit the Help Center for more information. $\endgroup$ – user477343 Aug 24 '18 at 11:25
  • $\begingroup$ Happy Puzzling! :D $\endgroup$ – user477343 Aug 24 '18 at 11:30

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