Factorial is calculated by taking the number and multiplying it continually by 1 less than that until you finally multiple by 1.
For example 6! = 6x5x4x3x2x1 = 720
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How can you calculate the square root of 1.8E-5 without a calculator?
4.75364334 × 10122 google calculator
by calculate in mind
http://en.wikipedia.org/wiki/Methods_of_computing_square_roots
Example: Calculate 6 factorial... On the home screen [Clear] Press [6] [Math] and the left arrow key - this selects the PRB menu Press [4] for ! Press [Enter] The answer, 720, is displayed.