Wolfram Research
Wolfram Math World: Factorial
This page gives a very complete description of the use of factorials in mathematics. The most general information is at the top.
Khan Academy
Khan Academy: Calculating Factorials (Practice)
This is a 7-problem quiz/practice on calculating factorials.
Oswego City School District
Regents Exam Prep Center: Factorials
This math tutorial defines factorial notation and features practice problems and a teacher resource page.
Google
Google for Education: Factorials With Names
Students investigate how many unique arrangements of the letters in the name Bryant are possible as an introduction to factorials. Bryant can be replaced by any name, keeping in mind that if there are any repeated letters some of the...
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Permutations, Factorials and Combinations
Thirty-one problems present a variety of practice working with permutations, factorials and combinations. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the...
Khan Academy
Khan Academy: Challenge: Recursive Factorial
Practice solving recursive factorials with these problems.
Khan Academy
Khan Academy: Challenge: Iterative Factorial
Practice applying recursion with iterative factorials.
Khan Academy
Khan Academy: The Factorial Function
See examples of recursion, and look how to compute the factorial function.
Shmoop University
Shmoop: Basic Statistics & Probability: Factorials
The probability resource investigates factorials. Students learn about the topic through notes and examples. The tutorial consists of practice exercises to check for comprehension of the concept.
CK-12 Foundation
Ck 12: Analysis: Factorials and Combinations
[Free Registration/Login may be required to access all resource tools.] In this lesson students are provided a review of factorials and combinations. Students examine guided notes, review guided practice, watch instructional videos and...
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Factorials
Find a quick, concise explanation of factorials. An example is given and clearly explained.
Texas Instruments
Texas Instruments: Counting Principle, Combinations, and Permutations
Students will solve discrete math problems involving permutations, factorials, and combinations. Students are responsible for deciding which is appropriate to solve a given word problem.
ClassFlow
Class Flow: Divisibility & Factorials
[Free Registration/Login Required] Testing for divisibility of 0, 2, 3, 4, 5, 9, 10 & 11. This flipchart explores factorials and perfect numbers as well.
Interactive Mathematics
Interactive Mathematics: Counting and Probability
An introduction to the concept of counting and probability includes working with factorials and finding the probability of an event.
CK-12 Foundation
Ck 12: Probability: Permutations Grades 10 12
[Free Registration/Login may be required to access all resource tools.] This lesson covers how to define and use factorials to determine the number of permutations or arrangements of objects.
Texas Instruments
Texas Instruments: Numb3 Rs: Is This Seat Taken?
Based off of the hit television show NUMB3RS, this lesson introduces students to permutations, factorials, and counting principle. The lesson is framed in the context of a wedding, in which (at first) people are arranged to sit in a...
Varsity Tutors
Varsity Tutors: Hotmath: Graphing Calculator Practice: Discrete Mathematics and Probability
Practice using your graphing calculator for factorial, combination, and permutation expressions. If you get stumped or if you would like to check your work, then select the View Solution button, which is located directly under each problem.
Math Notes and Math Tests
Pre Calculus Notes: Sequences and Series [Pdf]
The tutorial discusses sequences and series. Students learn about factorials, recursively defined sequences, and summation notation. The resource consists of class notes and examples with solutions.
Other
Lake Tahoe Com. College: Fundamental Counting Principle
Explains the fundamental principle of counting, which is the beginning point for any study of counting techniques such as combinations and permutations.
CK-12 Foundation
Ck 12: Probability: Permutations and Combinations Compared
[Free Registration/Login may be required to access all resource tools.] Covers the formula for permutations.
Wolfram Research
Wolfram Math World: Topics of Permutation
This MathWorld site is a lite to link to a multitude of sites involving permutations. Look through to find your specific needs. If you are looking at this site with regards to a probability and statisics class you will probably want to...
National Council of Teachers of Mathematics
The Math Forum: Why Does 0! = 1?
Dr. Math describes the reasoning behind 0! = 1.
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