I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...

In this video, we work through 43 different examples for simplifying radical expressions. We focus on the square roots of ...

A number is divisible by 9 if the sum of its digits is greater than or equal to 9. 621 (6+2+1=9), for instance, is divisible by 9. Simply move the decimal point one place to the left to find the 10% ...