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Browse Middle School Factorials
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Table of factorials, 1!30!
 Given a Factorial, Find the Number [05/02/2003]

How can we find a number if the factorial is given?
 Smallest Value of N!; Factorial Table [11/07/2001]

If N! ends in exactly 3 zeros, what is the smallest possible value of N?
 What Is N Factorial Used For? [08/29/2001]

I have heard that it is used in probability, but what for, and how?
 x Factorial and the Gamma Function [05/29/1998]

What is x! when x is 0, negative, or not a whole number?
 Choosing 3 of 6 Colors [03/03/2000]

Patrick has a box of crayons with red, blue, yellow, orange, green and
purple. How many different ways can Patrick select 3 colors?
 Circumference of a Circle, Value of 5! [5/15/1996]

The area of a circle is 16 pi. What is the circumference of the circle?
Also, what is the value of 5!?
 Combinations of Coins [1/28/1996]

If I had 6 coins in my pocket, how many combinations could I have?
 Decimal Places in Large Factorials [04/29/2003]

Is there an easy way to find how many decimal places or how many zeros
the decimal notation of a large factorial number will have?
 Derivative of x! [05/27/2003]

My PreCalculus teacher gave my class several derivative practice
problems to do in our spare time, one of which is: (d/dx)(x!).
 Double Factorial [02/22/2002]

Can you tell me what two ! marks mean in factorial questions?
 Factorial [4/1/1996]

What is factorial?
 Factorials [11/15/1994]

One day when I was playing on a calculator, I found that 1 and 0 both
have a factorial of 1. Can you explain this?
 Factorials [02/07/1998]

How do you find the number of zeros at the end of a number factorial?
For example, 100! or 130!
 Factorials [2/3/1996]

What does 3! mean?
 Factorials and Order of Operations [09/21/2000]

Where do factorials go in the order of operations?
 Factorials of Negative Integers [06/27/2002]

Is it possible to compute factorials for negative integers?
 Find the Last Eight Digits of a Factorial [1/30/1996]

Find the last eight digits of 69! where 69!=69x68x67........x1
 Given x!, Find x [12/21/2002]

If the value of x! is given, how do we find the value of x?
 Googol Factorial [11/09/1996]

What is googol factorial?
 How Big is a Googolplex? [05/29/2003]

Is there anything on Earth that is as big as a googolplex?
 How to Evaluate 4!!!! [10/16/2003]

Our Calculus 2 teacher has challenged us to find the exact value for
4!!!!, but the number is too large to reasonably calculate by hand.
 An Informal Argument for Why 0! = 1 [01/13/2008]

I don't understand why 0! equals 1. Can you explain it?
 Odd Factorial [12/24/2001]

Can a factorial ever be odd?
 Origin of the Factorial Symbol ! [01/14/2002]

My students would like to know the origin of the mathematical symbol for
factorial  !.
 Representing a Number [10/29/2001]

How can you represent the number three without using any letters or
variables or the digits 1 through 9?
 Six Billion Factorial [05/15/2003]

6 billion p 100. I know how to do permutations but there must be a
quick way to do a problem like this.
 Zero Factorial [05/24/1999]

Why does 0! = 1?
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