10.6?
Nice game!
by one decimal do you mean one decimal point? (if so their are infinte possibilities) or only one number place after the decimal?
10.9
1 is not prime. One has only one factor, while a prime has exactly 2. The number "1" is one of the only numbers that is neither prime nor composite. The other one that shares this quality is zero. And somebody must have guessed the correct answer already; the only choices are:
10.1, 10.4, 10.6, 10.8, and 10.9. All of these have been guessed already, and 10.0 is out of the question...
Its wher you try to guess a number from clues. I'll start.
The number I am thinking about is greater than 10, less than 11, has one decimal, and none of the numbers are prime.