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Monday, November 14, 2011

Finding sqaure roots of rational numbers

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

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

√25/81 =5/9

√0.0144= 0.12
Check your answer: 0.12 x 0.12= 0.0144
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
Check your answer: 0.09 x 0.09 =0.0081

√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

- 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.


  1. Good post Allison! I liked how you put the most important things in red. Remember to add a video and a link to your post! Also who is doing the next blog.

  2. Ali square root of 0.0025 is a perfect square add another o before the 2 and after the decimal place please.

  3. Good job Allison! Thank you for doing today's blog because I missed this math class and I needed to take down these notes. I thought you explained everything very well and your reminders were nice and big. So I couldn't miss it. To improve your next blog, try to add a video or a link and some pictures. Other than that, great job!

  4. Great post Allison! Your blog was very well explained and it made it easy for me to understand. I was also not here for this class but I will get caught up because your blog was very clear about square roots. I liked how the homework font was very big which attracted my eye. When you were talking about 8.10 and 8.1 being the same, you put the word 'save' instead of 'same'. Next time read over your blog so you don't have any mistakes. Other than that good job!

  5. Great job allison, you did a god job explaining what you did in class and made it clear with the people who weren't in class. Good job changing the font and te size forthe important notes, but next tim you should add links and videos. Keep up the goodwork!