Khan Academy: Basic Set Operations: Universal Set and Absolute Complement

Please Excuse My Dear Aunt Sally - or whichever mnemonic your students use for the order of operations - is the focus of this video. Sal takes viewers through various mathematical equations which require the use of the order of...

A video showing working with sets.

A video about the union and intersection of sets. [7:44]

A video of basic set and subsets operations.

A video proving that the orthogonal complement of the orthogonal complement of some subspace V must be a member of the original subspace V. Proves that V and the orthogonal complement of the orthogonal complement of V are exactly the...

Adding and subtracting matrices.

It's the classic please excuse my dear aunt sally strategy to remembering the order of operations. Young mathematicians practice to develop an understanding of the order of operations. Examples and practice problems include...

The concept of absolute value can be difficult for learners to grasp. Reinforce their understanding of a basic absolute value expression and connect it to solving equations and inequalities. Scholars write two equations/inequalities to...

This video demonstrates how to solve an equation that contains absolute values. It also shows how to check your answer. This video also appears in the strand Algebra: Absolute Value. [3:26]

This video introduces the concept of order of operations with several examples.