Karen's Volume Scribepost

SKY 248. What is the volume of the right cylinder?

My answer:

SYK 249. Which box has the greater volume? Explain your reasoning.

My answer:

Pages 250-253 #'s 1, 4 and 7
1. Evan calculated the volume of a right cylinder. Charlotte calculated the volume of a right rectangular prism. Did either of them make an error in their solutions? Explain how you know.

My answer:

4. What is the volume of each right prism?

a) area of base = 12cm², height = 8cm3

b) area of base = 18cm², height = 4cm3

c) height = 9cm3, area of base = 14cm²

My answer:

7. What is the height of each of the following right rectangular prisms?

a) volume = 32cm3, area of base = 8cm²
b) volume = 35cm3, area of base = 5cm²

c) area of base = 8cm², volume = 36cm3

My answer:

Here is a video showing how to find the volume of a cylinder.
Here is a video showing how to find the volume of a rectangular prism.

*Sorry it's so messy, I can't fix it and I

'm too lazy to do it all over again.


Cylinder Volume and Volume Problems

Jumbo Popcorn:
r = d/2
r = 20/2
r = 10cm^2
areaofthebase x height
v= π*r*r*h
v= (3.14 x 10 x 10) x 40

v= 12 560cm^3

Popcorn Lover's:
r = d/2
r = 30/2
r = 15cm^2
areaofthebase x height
v = π*r*r*h

v = (3.14 x 15 x 15) x 20
v = 14 130cm^3
Martha should get the "Popcorn Lover's" if she wants more popcorn because the container is bigger by 1 570.

r=d/2

r=1/2

r=0.5m^2

areaofthebase x height

v=π*r*r*h

v=(3.14*0.5*0.5)*10

v=7.85m^3

r=d/2

r=0.8/2

r=0.4m^2

areaofthebase x height

v=π*r*r*h

v=(3.14*0.4*0.4)*10

v=5.024m^3

7.85m^3*5.024m^3 = 2.862m^3

The volume required to make a concrete culvert is 2.862^3.

Olivia's Percent Scribe Post

Page 142-143





4. a) 20% of 60 is 12.



b) 250% of 400 is 1000.




c) 10 1/2 % of 100 is 10.5.






The price was reduced by $21.42.







^ I was going to do that one but I got confused and gave up. If anyone can help me with that question I would appreciate it. :)

So instead I did this one:








The area of Manitoba to the nearest square kilometre is 649 004 square km.

That's the end of my post. :) Leave comments please, to tell me what I did well and what I could improve on. :)

Ryan's Scribe Post

8. The original price of a jacket was $84.00. A store manager marked the price down by 25 1/2 %. By how much was the price reduced?

Math Info
* Original Price = $84. 00

* Price down by 25 1/2%
* 25 1/2% = 25. 5%

Math Info

* 25. 5% = $21. 42

The price was reduced by $21. 42.

10. When water freezes, its volume increases by approximately 10%.
a) By how much does the volume of 750mL of water increase when it freezes?

Math Info

* 10% increase

Math Info

* 10% = 75mL

The volume increases by 75mL when it has an original volume of 750mL.

b) What is the volume of ice created?

Math Info

* 750mL = 100%

* 10% = 75mL

750mL + 75mL = 825mL

The volume is 825mL.

16. Josephine scored 12 baskets out of 30 shots in her first basketball game this year. Her scoring average was then 40%. The next game, she made ten shots and raised her scoring average for both games to 50%. How many of the ten shots in the second game were baskets?

Math Info

First Game

* Scored 12 baskets

* Took 30 shots

Second Game

* Took 10 shots

* __ shots out of 10 = baskets

* Average = 40%

All Games

* Scoring Averge = 50%

* Took 40 shots [30 + 10]

* 50% of 40 shots = 20 shots

Math Info

* 8 shots out of 10 = baskets

8/10 shots were baskets.

Hanna's Scribe Post

9. The highest point in Canada is Mount Logan, which is in the Yukon Territory. Mount Logan is 159% as high as the highest point in Alberta, Mount Columbia. The elevation of Mount Columbia is 3747 m. What is the elevation of Mount Logan?

The elevation of Mount Logan is 5957.73 m.


11. The area of Canada is approximately 9984760 km². The area of Manitoba is about 6 ½% of the area of Canada. What is the area of Manitoba to the nearest square kilometre?

The area of Manitoba is about 649004km².

12. A manufacturer of electric hybrid vehicles claims its vehicle will travel 200% as far as its

regular vehicle on a full tank of gas. If the regular vehicle travels an average of 550 km on a full tank, how far will the hybrid go?

The hybrid should go 1100km far

Jocelyn's scribe post

Jocelyn's scribe post

This is questions #4 use mental math to solve problems
a) 20% of 60 - answer) 12 is 20% of 60
b) 250% of 400- answer)1000 is 250% of 400
c) 10.5% of 100- Answer)10.5 is 10.5% of a hundred

This is question #7 200 tickets were sold
a) what is the percent of winning with one ticket- answer) 1% of 200
b)how many tickets would you have to buy to get a 2.5% chance of winning- answer) 2.5 tickets to get a 2.5% chance out of 200

This is question #16
Josephine haad an average of 40% after her first game, the second game she had ten shots and finished with an average of 50%. How many baskes did she make out of ten- Answer) 8 baskets went in out of the ten