The number 18 belongs to the following categories of numbers:
Complex
Real
Rational
Terminating, non-rec curing decimals.
Natural
Composite
Even
Factors of 2
Factors of 9
Factors of 3
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The "median" is the "number in the middle", if you sort the numbers. If (as here) the set has an even number of elements, you sort them, and then take the average (arithmetic mean) of the two numbers in the middle - in this example, the 5th and 6th number.
120 over 18 as a mixed number = 62/3
The number is -9 because (-9/-9) -18 = -17
1 + 17 = 18 5 + 13 = 18 7 + 11 = 18
18