What does it mean to square a number, a fraction, or a decimal?
Why do you get a positive number when you square a negative number?
Why do positive numbers have two square roots?
What are the square roots of 16?
What is the principal square root of a number?
How do you find the square root of a number?
What is the square root of 81?
What is the square root of 0?
What is the square root of -9?
How do you find the square root of a negative number?
How do you find the square root of a fraction?
What is the difference between -sqrt(49) and sqrt(-49)?
What is the square root of 9/16?
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This lesson starts out as an introduction to squaring numbers. Then, this leads into the idea of square roots. Several examples are shown to explain what it means to take the square root of a number, when you can calculate it and when it is not a real number, and how to find the value of a square root. Also, the principal square root is explained. A very good introduction to the idea of radicals / square roots.