Wednesday, Feb. 20th

Hello all:
Here are the answers to yesterday's work. Please check your answers and turn your work back in.

(Click the image to make it larger)

Use today's class to go through the answers you got wrong and try to figure out what happened. Please be sure to use the examples on the right-hand side of the page - they are great references. 

If you're finished checking your answers and you're comfortable with moving forward, move on to pg. 168, 43 - 53. 

Thursday 2/14

Happy Valentine's Day!!!

Please check your work from yesterday:

P.S. - Did anyone get snow last night? I did! :)

Please move on to pg. 167 today. Remember, no calculators. Get through as many as you can, #s 19 - 42. Remember, we're only using calculators for this chapter when we're dealing with perimeter or circumference. Hand in what you have @ the end of class. Have a great weekend!

Wednesday 2/13

Hello, folks. Roscoe is blogging for me today. He says, "If you finished the Chp. 4 practice test yesterday, check your work (click the pic to make it bigger). If not, please finish and then check. Be sure to circle any you got wrong, then turn in to your teacher."

If you haven't already noticed, we are reviewing everything we've learned in Chapter 4. It's been our hardest chapter yet, so please rely on your class notes, previous blog posts, and your textbook for help. 

Today's assignment:

After checking yesterday's work, complete pg. 166, 9 - 18. 

If you finish early, you may move on to pg. 167, 19 - 26. 

Please make sure you are turning all your work in to your teacher. Roscoe says, "Happy Decimal-ing!" :)

Tuesday 2/12

Here are the answers for your circumference packet. Please click on the pictures to enlarge them. Check your work and leave comments for anything you have questions about. *Please note that for a lot of you who handed work in, you used the formula to find Circumference with diameter (d) on questions for which you were given the radius (r). Remember, when given the diameter:

 C = πd 

But when given the radius, the formula changes:

C = 2πd 

This is because the radius of a circle is only half the length of the diameter. So we multiply the formula by 2. 

Circumference concludes Chp. 4 for us. Today's assignment is pg. 169, 3 - 20. You may only use a calculator for 17 - 20; when you take your actual test, you'll be required to show all work for adding, subtracting, multiplying, and dividing decimals. Please turn in your assignment at the end of class. 

Friday's Class

...or will it be Monday's class?! Dun dun DUUUUNNNN... :)

(I wonder if we'll have snow/ice tomorrow?)

Please check your answers for the last page in yesterday's Perimeter packet (pg. 191):

1) About 2,090 km

2) 39 in.

3) 48.5 ft

4) 24 ft

5) 1,840 yd

6) 130.72 in.

7) 43.701 in.

8) 0.916 m

If you had any problems with finding the answer, please leave me a comment below. 

Please turn your packets in (place them in the Inbox). 

Today we're going to be taking a look at Circumference. Circumference is the distance around a circle. Check out this diagram from kidsmathgamesonline.com:

Diameter (d) is the distance a cross a circle through its center. 

Radius (r) is the distance from the center to any point on a circle. 

And, as we said, Circumference (c) is the distance around a circle. 

There's a formula to figure out what the Circumference of a circle is:

C = πd 

This says "Circumference = pi times the diameter"

What is that little symbol? That "pi" thing??? Well, it's not a pie, although I could certainly go for a cherry pie right now. 

tasteofhome.com

Anyway. Pi is a number that we use to find Circumference. Use a calculator to find the real value of pi by pressing the  π  button on your calculator. It goes on forever - so we round it to 3.14. 

Now that we know what pi is, we can find the circumference of any circle as long as we know it's diameter. Let's say we have a circle with a diameter of 4.5 inches. All we need to do is plug the numbers into the formula:

C = 3.14 x 4.5

Then, using your calculator or your multiplying decimal method, solve for C:

C = 14.13

We know that the circumference is 14.13 inches. 

There's another way to find Circumference - this time, using radius. Take a look at the circle diagram above. Did you notice that the radius is exactly half the length of a circle's diameter? So to find the Circumference of a circle using the radius, we use the following formula:

C = 2πr

This says "Circumference equals 2 times pi times the radius of a circle."

Again, all we have to do is plug the numbers in. If we have a circle with a radius of 38 ft, we would plug the numbers in like so:

C = 2 x 3.14 x 38

Now solve for C.

C = 238.64 ft.

Once you know the formulas, and remember that pi = 3.14, you're good to go. 

Please read through the bottom of pg. 161 through pg. 162. Then, using a calculator (or by hand), complete questions 9 - 18 on pg. 163. 

You will be turning this in. Please place in the inbox when finished. 

Have a fantastic weekend everyone!

Thursday's Class

Hey guys! I hope you are all enjoying Raven's Day. Please know that you may begin to use your calculators now until otherwise noted.

Please pair up with a friend and check your answers from yesterday's Perimeter packet. Here are the answers:

pg. 189:
1) 10 in.
2) 26 yd
3) 20 ft

pg. 190:
1) 14 ft
2) 26 in.
3) 16 in.
4) 49.4 yd
5) 39.2 km
6) 22.6 mi
7) 33.6 km
8) 15.4 cm

How'd you do? Leave a comment and let me know. Today's classwork is an individual assignment. Work quietly on the last page in your Perimeter packet (pg. 191) - Word Problems and Perimeter. Hold on to this - you will be checking this tomorrow.

Wednesday's Class

Hello my little Mathbugs. Sorry I can't be with you this week. 

Please take the first few minutes of class to check your work from yesterday's worksheets. The answers are as follows:

pg. 184

1) 7

2) 2.1

3) 23.4

4) 7.21

5) 500

6) 159.9

pg. 185 (Remember, the directions said "round to the nearest hundredth if necessary")

1) 24.3

2) 3.6

3) 12

4) 4.5

5) 3

6) 18

7) 0.21

8) 8.1

9) 1.53

10) 16.51

11) 1.24

12) 4.69

13) 18.12

14) 2.46

15) 4.02

16) 6.39

17) 18.52

18) 16.35

After checking your work, pair up with a friend to see what, if anything, went wrong. Try to help each other out. I have enabled comments on this blog so that you can leave a question for me if you're having a hard time. I know dividing with decimals is tricky, but you can do it!!! Just remember to move the decimals. 

Once you & your partner are finished going over your answers together, ask your substitute for a Perimeter worksheet. Do not lose this - you will be working on it today and tomorrow. You will hand it in tomorrow. Please complete the front and back of the first page today (pgs. 189 and 190). You'll be checking your work tomorrow. Remember to read the Study Guide on the first page if you get stuck on perimeter. For the shapes that are not rectangular - remember that we can add all the sides together to find the perimeter without using a formula. 

Good luck!