Khan Academy: Reasoning About Unknown Variables: Divisibility

Equipped with several examples from the attached module and from standardized tests, Sal takes viewers through the process of prime factorization and divisibility. He demonstrates each skill several times with many different numbers,...

How will learning about the divisibility rules help you do better in math? Well, if you have multi-digit numbers to factor, these rules will definitely help you factor numbers more quickly.

Sal explains what it means for a polynomial to be a factor of another polynomial, and what it means for a polynomial to be divisible by another polynomial. [5:25]

Learn what it means for polynomials to be factors of other polynomials or to be divisible by them.

Video lesson about rules for finding the derivative by generalizing examples. Includes the power rule and addition rule and uses these to find the derivative of different polynomial functions. [9:50]

Video lesson introducing the product rule and its formal definition. Examples of solving for the derivative of functions using the product rule and chain rule are shown. [8:49]

This video shows how to determine the prime factorization of a number to determine divisibility. Practice problems are available. [8:13]

A video that demonstrates how to solve equations with variables on both sides. The first two examples give the equation and the third example is a word problem in which an equation must be written and then solved. This video is also...

Video reviews the empirical rule (68-95-99.7 rule) and gives examples using it to approximate probabilities. Includes link to practice problems. [10:25]

A continuation of the video Introduction to Interest also from the Khan Academy. This segment develops formulas for both simple and compound interest using the variables P, r and t. After each of the formulas are derived, they are used...