Gallery walk

Do not forget that your district assessment is Tuesday of next week. On Monday please bring a signed note indicating that you have studied. You also need to bring your Post test paper back on Monday. Please review the links pertaining to rational numbers, Pythagorean theorem, and scientific notation.



Remember that you may also sign up for our podcast and receive our video lessons.

Operations on rational numbers part 3

The following video explains some of the questions that we have worked in class.

Some animation links

Your project is due 11/13/09. The description of your project may be found here. You may use animation as one way of presenting the information. If you do so you may click the following link. I will add more animation possibilities at another time.

Checkpoint tomorrow

The following video explains some questions that relate to your checkpoint tomorrow.




Below you will find a copy of the questions that are explained in the video.

More pythagorean theorem examples

Remember that each topic that we learn is not completely separate from other topics. Therefore, even though Pythagorean theorem is used many times as a formula it may also be interpreted geometrically. The following video demonstrates how we can connect those ideas.

Grades are exported this Friday

Your final opportunity to improve your grade will be this Friday. Please make sure that you return your unfinished test correction tomorrow. Also, please make sure that you practice applying the Pythagorean theorem because you will have questions related to it on your next checkpoint. This will be included in your major grades. Your homework is pg.165 numbers 8-19,33, and 34.






Below there is a description of your project that will be due November 13:

Pythagorean theorem geometrically speaking

The Pythagorean theorem is " a^2 + b^2 = c^2 " where a and b represent the length of legs and c represents the length of the hypotenuse. This formula is often read as "a squared plus b squared equals c squared." When it says "squared" geometrically you are using actual squares. When you add the areas of the squares on the legs it should equal the area of the square on the hypotenuse. If these areas do not add up then that means that the sides of those squares do not form a right triangle. The video below demonstrates that idea.


Also, the sides of the right triangle that form the 90 degree angle are called legs because they support the hypotenuse the same way that our legs keep us from falling. Also the hypotenuse comes from Greek words ( hypo - which means under, and teinein - which means to stretch) that give us the idea that it is the line that is stretched between the two legs of the right triangle.

No Homework tonight.



Also, don't forget that if you have trouble with pythagorean theorem you may see some more examples on our wiki.

Answers to our last test

Most periods did well on the test, however there were some popular mistakes. These mistakes are discussed in the video below. Also, do not forget that everything that we will do for the year is shown on the podcast and on our class wiki.

You may explore topics like scientific notation and pythagorean theorem on the wiki.

On each of those pages there are example TAKS problems, but there is also a separate page dealing with the TAKS test

Assessment tomorrow

Do not forget that you must have a study note signed by your parent when you take your assessment tomorrow. Also, please practice the concepts that we have discussed so far. I have posted a practice test in the box.net sidebar on the lower right side of your screen to help you practice your concepts for the test. Also, I have included a copy of it below.

Estimating square root word problems

You may have word problems involving estimating square roots. They may appear as a question in which you are estimating the length of the side of a square with a given area. For example, suppose you are asked the following " estimate the side length of a square if the area of that square is 14 square centimeters." In this case you should determine the perfect squares that this number falls between, then use that to estimate the square root of 14. First, 14 is between 9 and 16. So the square root of 14 is a number between 3 and 4. If you guess that this number is 3.7, you should multiply this number times itself to see if that product is close to 14.


The homework tonight is pg. 150 numbers 10 to 24 even. Also, do not forget study island.

More on estimating square roots

Today many of us were able to estimate the square root of irrational numbers. For those still experiencing difficulty just remember that your perfect squares tell you what numbers your estimated square root should be between. For example if we needed to find out the square root of 28, we know that 28 is between the perfect squares 25 and 36. Since the square roots of these numbers are 5 and 6 respectively, then the square root of 28 is going to be a number between 5 and 6. We can then guess and check our answer by multiplying that value by itself. The following video contains an example. You may also click here for more information on estimating irrational numbers.


The homework tonight is to read pages 148-9 and complete problems 9-25 (odd), 27-31, 33-42. Also, this week you have a study island assignment. The assignment is titled: "Rational and Irrational numbers 3." I will give you until next Friday to complete this study island assignment. Please remember that you may redo it for a higher grade. Do not guess because it will make your grade lower. Also you have a test this Friday.

Estimating square roots

Estimating square roots is a concept that has many applications. You may see this concept as a step in a word problem, or in problems testing your knowledge of the pythagorean theorem. It may even be used in a situation where the area of a square is given and you must find the length of the side. The homework from last week thursday was to do pg.136#27-36 and pg. 138#66-75. Tonight's homework is to describe :1. how to convert numbers from scientific notation to standard form. 2.a Strategy you may use when dealing with word problems involving elevation or temperature. Also, you will receive another study island assignment this week.