The document discusses square roots including: 1. Defining square roots and the radical symbol, and that the square root of a number can be positive or negative. 2. Explaining that the principal square root is always positive and how to identify squares of integers from 1 to 20. 3. Giving examples of simplifying square root expressions and identifying numbers as rational or irrational. 4. Discussing estimating square roots by finding what two consecutive integers a square root lies between.

1. Square Roots Basic Lesson