Monday, April 12, 2010

Areas and Integers


Areas:
I am creating two circular flower beds in my front yard. The first flower bed has a diameter of 12m and the second one has a radius of 8m. My front yard is 20m wide and 30m long. The rest of the front yard is grass will I have to cut?

r=d/2
r=12/2
r=6

Area of a circle:
A=pi r squared
A=3.14 multiplied by 6m squared
A=3.14 multiplied by 36
A=113.04m squared

Area of a circle:
A=pi r squared
A=3.14 multiplied by 8m squared
A=3.14 multiplied by 64
A=200.96m squared

Area of a rectangle:
A=b multiplied by height
A=30 multiplied by 20
A=600m squared

113.04m squared + A=200.96m squared= 314m squared

600m squared - 314m squared= 286m squared

You would have to cut 286m squared of grass.



You have a triangular shaped yard with a base of 10m and a height of 15m. You are creating a sand box for your kids. The sandbox has a circumference of 6.28m. How much yard do you have left.

C=pi d
C=2 pi r
6.28=2 (3.14) r
6.28/6.28= 6.28r/6.28
1=1r
1m=r

Area of a circle:
A=pi r squared
A=3.14 multiplied by 1m squared
A=3.14 multiplied by 1
A=3.14m squared

Area of a triangle:
A=b multiplied by height/2
A=10 multiplied 15/2
A=150/2
A=75m squared

75m squared - 3.14m squared= 71.86m squared

You would have 71.86m squared of yard left.




Integers:

Integers are positive and negative whole numbers and zero.

eg.2, -6, 91, +103, -1000, 0.
not integers: -3/4, +1/2, 4/5, 0.1, -0.7, 91.3, 1.3, 95%, -60%.

Integers can be shown on a number line or using integer chips.

BLUE CHIPS= negative numbers RED CHIPS= positive numbers

000 = -3

000= +3



Homework:

Identify each integer

a) 0 b) 0 c)000 d)00000 e)0000000 f)00000

Represent each integer:

+2, 8, -4, +7, -6, -8.



CLICK HERE for a link that may help you understand integers better.


Here is a link for a video. I went on YouTube to find a video and there was no place that even shows the embed so I had to post the link. Sorry for the inconvenience. http://www.youtube.com/watch?v=SZf2UUsMhfI&feature=PlayList&p=3A35B91F32C28418&playnext_from=PL&playnext=1&index=47






25 comments:

  1. Good job.Emily you did a great job on your blog and explaining integers.You put a video and picture.But you could have put some more fonts to make it colourful.But it was still a good job.

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  2. Great job Emily. It looks very neat and organized. you could have put more colors to it to make it better. Other than that great job.

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  3. Good jod Emily! It looks very nice and organized but for some reason the link didnt work for me,but other then that u did great!

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  4. You did a good job on the post Emily ! i like how you used different colored fonts to make some words stand out.

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  5. Nice post Emily! The scribe is very organized and neat. Also I really liked how you used different colors for some of the words.

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  6. Great post, Emily! Your scribe looks very organized and neat. I really liked how you used different colors.

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  7. great post Emily. Its very neat and well organized and you made words stand out by putting different colors.

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  8. Thanks for commenting. I'm sorry if the link didn't work.

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  9. Great job emily everything was well organized but you could've changed some colors for the important words so it's more easier to know them but everything else was great.

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  10. Great post, Emily! Everything is well organized and the pictures really helped. I also liked how you changed the colors of the font to make it stand out.

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  11. Great Post Emily. I liked the Integer picture but next time I think that you should add the video not in a link.

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  12. Great job Emily. I like that your scribe was neat and organized. I also like when you changed the colours of the red and blue chips. Try to post the video on the scribe next time.

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  13. Good job Emily. I like how everything is very organized, but you put the video in a link.

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  14. Neat post, Emily! I like how it was organized. Next time, bold or change the colour of the important words.

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  15. Good job Emily Ii was very well done. Its okay if the link didn't work but next don't put a video to a link.

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  16. Great job. Great organization but to bad the link did not work and add a bit more colour.

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  17. The lind didn't work but on the other hand it was a job well done.

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  18. Nice post, add a little bit more color though

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  19. Good job, but you should add more colour, so it wont look so plain but everything was well organized.

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  20. Nice post Emily, try to add a video next time.

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  21. Nice post, Emily. I really liked how organized it was, but a little more color would make it a lot more eye catching.

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  22. Nice post, you could have tried to find another video.

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  23. Nice job, try to add more colour.

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  24. Great job but next time add more colour!

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  25. good job Emily. but try to add more colour next time.

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