**Math 6A, Lesson 4, Fall 2017, 10/01/2017**

**1. Square Roots**

3*3 = 9, 9 is called the **square** of 3, we also say that 3 is the positive **square root** of 9.

**2. Perfect Squares:** the number 1, 4, 9, 16, 25, … whose square roots are whole numbers are called perfect squares. We can find the square root of a perfect square by using prime factorization. Teaching on whiteboard in the class.

**3. Cube Roots**

2*2*2 = 8, 8 is called the **cub**e of 2, we also say that 2 is the **cube root** of 8.

**4. Perfect Cubes:** the number 1, 8, 27, 64, … whose cube roots are whole numbers are called perfect cubes. We can find the cube root of a perfect cube by using prime factorization. Teaching on whiteboard in the class.

**5. Home Work:**

- Handout: three pages
- Workbook:
- page 2: 8, 9
- Page 4: 18, 19, 20