New Blog!

Hey guys! I got a new blog! This name was too long. Keep up with us at:

http://landrumswag.blogspot.com/

Miss all of you and hope 8th grade is going well! --Ms. Cook

Perfect Squares and Square Roots

This concept is going to be really important as we move into working with 2 and 3D figures! Remember that "squaring" something is the same thing as taking it to the second power. What that means is that you take a nubmer and multiply it by itself twice. The answer you get when you square a number is called a PERFECT SQUARE. Here are some examples and practice on squaring things.

So, what is 3²??

3 × 3 = 9

So the perfect square is 9.


So what is 9 sqaured?

9 x 9 = 81

So the perfect square is 81. 


Practice

	Expanded  _ •_	Perfect Square	Square Root  √
22  squared
	13 x 13
		225
			17
	4 x 4

Square Roots
When you think of the radical sign, you should ask yourself, "What number multiplied by itself gives me the number under the radical sign?" Always be looking for the perfect squares!

Watch this video for help!

Go here for practice!



Imperfect Square Roots
If it isn't a perfect square, use estimation! Here are the steps:

1. Find the perfect squares the number under the radical is between
2. Take the square root of the perfect squares.
3. You have found the range of what your square root is!

Watch this for help!

Go here for practice!

Adding and Subtracting Integers

Hey students! Just wanted to do a short post with a few pointers for the integers homework! Remember when you are subtracting a negative, you have to take the opposite of it!

Ex:               4 - -2    ***put your parentheses
                   4 - (-2)
                        opposite of -2  is +2
                  4 + 2 (Model it!)
                   ++++
                   ++                          Answer: ___+6______

If you check the blog and does these problems correctly, you can get 5 extra credit points to your lowest grade! Good luck!

1.     -2 - (-4)

2.     -5 - 8

3.     3 - 9

4.     (-7) + (-6)

5.     -1 - -9

Getting ready to work with Integers!

I hope everyone enjoyed the 3 day weekend! I know that the STAAR Practice Writing was probably pretty stressful today, but I'm proud of you guys for pushing through! Only one more day of it then we return to a regular schedule. Remember that your graphing projects are due THURSDAY by 3:35!

Because it has been so long since I've seen most of you, I wanted to give you a preview of what we are about to move into. This is your homework that is due THURSDAY by the time you come to class!

Comparing and Ordering Integers

Compare. Write <, >, or = for each □.

***Remember < means less than and  > means greater than.

1. -7 □ +8 

2. -4 □ -1 

3. +10 □ 10

4. 0 □ -8 

5. -7 □ +3 

6. -8 □ -9

7. -7 □ +3 

8. 1 □ +1 

9. -6 □ 0

Order the numbers from least to greatest.

10. -6, -7, 2, -1 

_________ 

11. -8, 7, -10, 0 

_________ 

12. 5, 8, -9, -3

_________ 

Order the numbers from greatest to least.

13. 3, -4, 5, -6 

_________ 

14. 0, 5, -4, -8 

_________

15. -3, -2, -8, -10

_________

You can't make fun of me!

As promised, I made a remix to Beyonce's "Irreplacable." Because I made the video, you absolutely CANNOT make fun of how bad my voice is! Remember for the project today that you have to find the discount and tax for your item. Just a refresher on the steps of how to find the percent of a number!

Step 1- Remember "of" means MULTIPLY

Step 2- Convert your percent to a decimal (watch the video if you forgot how!)

Step 3- Multiply using decimal multiplication

Step 4- Move your decimal

Ms. Cook Sings to Beyonce's Song!

Hopefully this helps! Remember, YOUR PROJECT IS DUE ON MONDAY! If you want to take it home over the weekend to make it pretty/awesome, you can, but when Monday gets here, you will have to have it! Have a great weekend!

More preparation for your final!

So I hope that everyone felt comfortable with the final yesterday! If not, over the weekend, here are some more resources for you to practice with.

Concept 1-Converting between fractions, decimals, and percents
Watch these videos to help with the conversions!

Click here to see how to convert!

Here is a video of the "non-dollar" conversions

Here is some more practice!

Fraction	Decimal	Percent
	0.2
		75%
3/20
		62.4%
	0.384

Concept 2- The Percent Bar Model
This model is helpful for the visual learners. The whole idea behind the percent bar model is to be able to find the percent of some number. remember that some big benchmark percents to look for are 50%, 10%, 5%, and 1%. You can pretty much combine these to do any percent of a number!

Practice:

1. What is 20% of  45?
2. What is 33.3% of 36?
3. What is 85% of 60? (Hint use your knowledge of what 50%, 10% and 5% are!)

Answers to Practice to check yourself on:

1. 9
2. 12
3. 51

Concept 3- The Proportions Model
This model is helpful for the people who really like straight forward multiplication and division. Use the following formula to help you remember how to set it up.

                                                   part  =    ?%
                                                 whole      100%

When reading the question, it is helpful to identify and label so that when you set it up, you have everything in the right place. For example:

Ashley had a box with 30 cookies. She ate 10% of them. How many cookies did she eat?

• in this question, the 30 is the whole and the the 10% goes with the ?%

1. After you have identify each number is, you can set up the proportion.

                                             x      =   10% 

                                           30          100%
2. Now reduce the known ratio by simplifying.
                                              x      =   1%  
                                            30          10%
3. Re-write your proportion with the known ratio first.
                                            1%    =    x     
                                           10%        30
4. Find your scale factor.
                                            1%   x 3=     x      
                                           10% x 3        30
5. Solve
                                   x = 3 cookies

Practice: 

1. If 8 out of 20 students in a class are boys, what percent of the class is made up of boys?
2. 18 is 40% of what number?
3. What is 20% of 45?
4. What is 25% of 52?
5. What percent of 56 is 14?

Once you work through them, go check your answers HERE! Just look at the line that says "solution.

Concept 4- Discounts (Percent of Decrease)
Who doesn't like a discount?! I'm all about saving money! So think about when you go into a store and the shirt that you really want is 25% off. What a great feeling right?! Does that mean that you only pay 25% of the cost though? NOPE! If I am looking at the shirt and it is $20, I know that I'm going to be able to SUBTRACT a few dollars from that $20 price. Now let's figure out the total after the discount!

1. Identify what each number is and set up the proportion.
                   $20 is the WHOLE price, so it is my whole. 25% off is my ?%.
                                        x    =    25%  
                                      $20       100%
2. Reduce the known ratio.
                                      x       =     1%  
                                     $20           4%
3. Re-write your proportion with the known ratio first.
                                      1%    =     x     
                                      4%         $20
4. Find your scale factor.
                                      1% x 5 =    x     
                                      4% x 5      $20
5. Solve.
                                    x = $5
YOU AREN'T DONE THOUGH! You found out how much you get to subtract, but that doesn't tell you the TOTAL. 

                            Whole - Discount = Total                         $20 - $5 =  $15

Concept 5- Tax and Tip (Percent of Increase)
Except for one weekend a year, when you go to buy something at the mall, you don't get to pay the price on the tag. Your jeans may be $30, but when you get up to the register, you have to pay tax on those jeans. This means you have to pay and ADDITIONAL amount of money. If the tax rate is 10%, how much will you pay total?


1. Identify what each number is and set up the proportion.
                   $30 is the WHOLE price, so it is my whole. 10% tax is my ?%.
                                        x    =    10%  
                                      $30       100%
2. Reduce the known ratio.
                                      x       =     1%  
                                     $30           10%
3. Re-write your proportion with the known ratio first.
                                      1%    =     x     
                                      10%         $30
4. Find your scale factor.
                                      1% x 3 =    x     
                                      10% x 3     $30
5. Solve.
                                    x = $3
YOU AREN'T DONE THOUGH! You found out how much extra you have to pay for the tax, but that doesn't tell you the TOTAL. 


                              Whole + Tax (or tip) = Total               $30 + $3 = $33

Practice for Discount, Tax, and Tip is HERE!


If you are feeling like you need any more practice, you can go HERE and practice all of the concepts!  Have a great weekend and good luck on the final! 

Customize Countdown Timer

Answers to the Review

The internet at my apartment was down last night, so here are the answers. Better late than never! We will spend some time in class going over them! 

1. 2/5

2. 40%

3. 0.6 or 0.60

4. 60%

5. 5/8

6. 62.5%

7. 12/25

8. 0.48

9. 103/125

10. 82.4%

11. 10 students

12. 21 cookies

13. 24%

14. 65%

15. $2700

16. $30

17. $560

18. $3.60

19. $21.60

20. (BONUS) $39.74