Khan Academy
Khan Academy: Combinations
This 4-problem quiz/practice using introductory combination problems like if you have 5 friends and can pick 2 of them to join you on a boat ride, how many different groups of friends could you take with you?
Math Is Fun
Math Is Fun: Combinations and Permutations
Combinations and permutations are explained clearly, with lots of examples. Includes practice questions.
Math Is Fun
Math Is Fun: Combinations and Permutations Calculator
By entering terms for how you want to combine items, you can use this calculator to determine all the different combinations and permutations you can have. For more advanced users, various rules are explained and how to use them.
Math Planet
Math Planet: Combinations and Permutations
Gain an understanding of combinations and permutations by viewing an example and a video lesson. [1:15]
PBS
Pbs Learning Media: Lock Combinations of Knobs and Keys
In this Cyberchase video segment, Matt and Jackie must figure out which combination of knob and key will get them one step closer to retrieving the Black Crystal.
Other
The Actuarial Foundation: Let's Go to the Mall! Explorations in Combinatorics
Let's Go to the Mall! is designed to help young scholars understand the connection between various kinds of combinations (multiplication principle and choose numbers) and permutations.
National Council of Teachers of Mathematics
Nctm: Illuminations: Bobbie Bear's Vacation Outfits
Help Bobbie Bear figure out how many outfits he could make with his shirts and pants. He can have up to 5 shirts and 4 pants. Figure out all the possible combinations.
University of Cambridge
University of Cambridge: Maths and Sports: Arsenal Collection: Football Formations
How many different football team formations can you find? This activity provides an engaging real-life context to investigate simple combinations, and is aimed at Key Stage 3 students.
University of Cambridge
University of Cambridge: Maths and Sports: The Games' Medals
Who could have won the gold, silver and bronze medals? This activity is designed to be accessible to primary pupils at Key Stage 1.
Louisiana Department of Education
Louisiana Doe: Louisiana Believes: Eureka Math Parent Guide: Addition and Subtraction of Length Units
A guide to support parents as they work with their students addition and subtraction of length units.
Other
Lake Tahoe Com. College: Permutations and Combinations
Gives a basic introduction to combinations and permutations, highlighting the ideas of counting using replacement versus without replacement, and when order is important versus when order is not important.
Interactive Mathematics
Interactive Mathematics: Permutations
Permutations are used in several detailed examples to demonstrate the method for finding the number of arrangements of events.
CK-12 Foundation
Ck 12: Probability: Tree Diagrams Grades 10 12
[Free Registration/Login may be required to access all resource tools.] This lesson covers Tree Diagrams, combinations or permutations to determine the probabilities of multiple events and probability distributions.
CK-12 Foundation
Ck 12: Probability: Combinations Grade 7
[Free Registration/Login may be required to access all resource tools.] Recognize and identify combinations.
Texas Instruments
Texas Instruments: Numb3 Rs: Social Security Numbers
Based off of the hit television show NUMB3RS, this lesson is good practice for students who have already learned about permutations. U.S. Social Security Numbers are explained, and then students find the number of different SSNs which...
PBS
Pbs Learning Media: Cyberchase: Force Field Combinations
In this Cyberchase video segment, the CyberSquad finds the right combination of switch, lever and button that will deactivate the force field protecting the stolen Black Crystal. [3:21]
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.
Interactive Mathematics
Interactive Mathematics: Combinations
The combination function is used to solve probability counting problems. Several examples are presented with detailed solutions.
PBS
Pbs: Jazz and Math: Improvisation Permutations
This lesson deals primarily with the number of rhythmic combinations that can be found in a four beat measure of music. Students will learn through trial and error and derive a mathematical formula to calculate the number of possible...
Texas Instruments
Texas Instruments: Let Us Count the Ways!
In this activity, students evaluate expressions using permutations and combinations of data elements on the calculator. They solve problems using these counting principles.
Alabama Learning Exchange
Alex: I Scream for Ice Cream!
In this lesson, students will figure out how many different combinations of ice cream flavors and cones they can make. Students will work cooperatively to make the different combinations. They will use various materials to actually make...
National Council of Teachers of Mathematics
Nctm: Figure This: Combination Locks
If you're good with numbers, then here's a challenge just for you. See if you can figure out how many three number combinations you can make using numbers from 0 to 39. A probability challenge that explores number arrangements. Taken...
Annenberg Foundation
Annenberg Learner: The Towers Problem
Build as many different looking towers as is possible, each exactly four cubes high using two colors of Unifix Cubes. Convince yourself and others that you have found all possible towers four cubes high and that you have no duplicates.
Khan Academy
Khan Academy: Counting Casts 2
In this 7-problem quiz/practice, using the numbers given, students must determine how many different ways can you cast this scene.