(-4+12)/2= 4
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11.5
13 is the only prime number between 12 and 16.
There are an infinite number of numbers between 12 and 13. decimals, fractions and irrational numbers
The number that lies in the middle of 9 and 12 is 10.5. This is calculated by adding 9 and 12 together to get 21, and then dividing by 2 to find the average, which is 10.5. In a number line, 10.5 would be equidistant from both 9 and 12.
9,10,11