## Monday, November 14, 2011

### Finding sqaure roots of rational numbers

√25
When we find a square roots we are finding the number that represents one side of a square. Why only one side? Because the length of one side is the same as all other sides and a square has 4 equal sides.

Then √25 is 5

√16/49
The square root is 4/7 because 4/7 x 4/7 = 16/49

√25/81 =5/9

√0.0144= 0.12
In the question 0.12 x 0.12 there are 4 decimal places in the question and 4 decimal places in the answer.

√0.0081= 0.09

√0.00025= 2.846049894
This is not a perfect square.

*You will need an even amount of decimal places for a perfect square *

√8.1= 2.846049894

This is not a perfect square because there is only 1 decimal place.

√8.10 is the save as √8.1
The reason for this is because the zeros after the last significant digit after the decimals does not change it's value.

3√64= 4

4 is the side length of a cube.
Cube = 4x4x4= 64

HOMEWORK!!
- Page 78 # 2 and 4
- Practice: 5 or 6, 7 or 8, 9 or 10, 11 or 12, 13 or 14
- Apply: All even or all odd and # 31
- Extend: Any 3
- Homework Book: 2.4, all of extra practice.
- Blog Post and comment on at least 4 blogs. If there are already 4 comments do NOT comment on that blog.

Mangahigh: FAI-TO
Tonight, November 14, 2011 we will be joining a fai-to at 7PM. Please go against Porchester school.