Q&A - PSLE Math

[tianzhu]

Neat:

Thanks tianzhu for your detailed and clear explanation.

Hi

You're welcome.

Best wishes

[bobsg01]

Thanks in advance for your answer: :? :?


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[starlight1968sg]

bobsg01:

Thanks in advance for your answer: :? :?


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Find area or perimeter ???

[bobsg01]

Sorry for the confusion.


This is the question on top:

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[ChiefKiasu]

bobsg01:

Thanks in advance for your answer: :? :?


http://i56.tinypic.com/yktg0.jpg\">

Diameter of external circle = 14 + 14 = 28cm
Area of external circle = 14^2 * PI = 616cm^2
Diameter of external circle = 28 * PI = 88cm
Area of shaded area
= Area of external circle - Area of square - Area of 2 small circles
= 616 - 14*14 - 2 (7^2 * PI)
= 616 - 196 - 308
= 112cm^2

[ChiefKiasu]

bobsg01:

Sorry for the confusion.


This is the question on top:

http://i55.tinypic.com/2a7h2dy.jpg\">

Area of external square = 18*18 = 324cm^2
Area of circle = 9^2 * PI = 254.57cm^2
Area of shaded area = Area of external square - Area of circle
= 324 - 254.57
= 69.43cm^2

[bobsg01]

Thank you ChiefKiasu.

[bobsg01]

Area of circle = 9^2 * PI = 254.57cm^2


Sorry, what the meaning of PI ?

[littlecloud]

Hi,

I need help with this question. Please help to solve this in a way that is easier to explain to a child. Thanks in advance.

Charis and Shermin are given some money each.
If Charis and Shermin spend $60 and $30 each day resp., Charis will still have $600 when Shermin has spent all her money.
If Charis and Shermin spend $30 and $60 each day resp., Charis will still have $1500 when Shermin has spent all her money.
How much money is given to each girl?

[MathIzzzFun]

littlecloud:

Hi,

I need help with this question. Please help to solve this in a way that is easier to explain to a child. Thanks in advance.

Charis and Shermin are given some money each.
If Charis and Shermin spend $60 and $30 each day resp., Charis will still have $600 when Shermin has spent all her money.
If Charis and Shermin spend $30 and $60 each day resp., Charis will still have $1500 when Shermin has spent all her money.
How much money is given to each girl?

Hi

Hope this helps - http://www.flickr.com/photos/62167097@N02/5746730078/in/photostream

cheers.