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?
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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.