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Check out these free Math videos:
They cover adding, subtracting, multiplying and dividing with fractions, percents, and decimals, as well as working with exponents. There are also videos on solving equations in one and two unknowns, and more! View the full playlist of math videos.
Fractions
Positive & Negative Numbers
Percents
Decimals
Special Properties of Numbers
Set Theory
This video has Barb Bernstein explaining some basic concepts in Set Theory, a branch of Mathematics. The material below reviews and extends the ideas that are presented...
Q: What is a set?
A: A set is a collection of things.
Q: What do we call the things in a set?
A: We call each one an "element" of the set.
Q: What kind of things can be in a set?
A: Anything can be an element of a set. You can have a set of flowers, or a set of breakfast foods, or a set of "school rules," etc.
Q: What is the difference between "combinations" and "permutations" in set theory?
A: A combination is just a list of some elements from a set. But permutations refer to how those elements are ordered. For example, suppose you have the set of people on a baseball team. You can list a group of them that play in the outfield. This would be a combination of players from the team, and the order they are listed in wouldn't matter. But if you list the first four players by their batting order, you have a list where the order does matter. That would be a specific permutation of the players who are listed.
Lunar Cars & Magic Words is a children's book adventure that introduces the ideas in set theory. For info, visit Wiseoldowlbooks.com