Q&A - PSLE Math

[MathIzzzFun]

kklau:

Hi,

Appreciate anyone's help for this question.

The diagram, not drawn to scale, shows two similar triangles and quadrants. Find the area of the shaded part.

http://i48.tinypic.com/9vi2ir.jpg\">

Thank you!

Hi

http://i47.tinypic.com/2u77kwn.png\">

cheers.

[tianzhu]

kklau:

Hi,

Appreciate anyone's help for this question.

The diagram, not drawn to scale, shows two similar triangles and quadrants. Find the area of the shaded part.

http://i48.tinypic.com/9vi2ir.jpg\">

Thank you!

Hi

P6 students will be well versed in finding out the area of square when its diagonal is given.

Shaded area -------- Area of semi circle of radius 10 cm - area of square with diagonal 10cm

Shaded area -------- (3.14*100)/2 – (10*10)/2 --------- 157 – 50 ------ 107

Best wishes

[MathIzzzFun]

Mr OK:

Hello everyone, I'm new to this forum. Would appreciate some help for these questions:-


2) There are some blue chips and red chips in a bag. If 2 blue chips are removed from the bag, the number of blue chips will be 1/6 of the total number of chips left.
If 4 red chips are removed from the bag, the number of blue chips will be 1/4 of the total number of chips left. How many chips are there in the bag?

Hi

using MD..

http://i49.tinypic.com/14w8ytt.png\">

cheers.

[MathIzzzFun]

Mr OK:

Hello everyone, I'm new to this forum. Would appreciate some help for these questions:-


3) Sally had 20 more books than Ali. After Sally gave 15 of her books to Ali, Sally's remaining number of books was 3/8 of their total number of books.
A) How many books did Ali have at first?
B) What is the difference in the number of books they finally had?

Hi

http://i48.tinypic.com/2mnq3nk.png\">

cheers.

[Chan09]

Hi Tianzhu,


Sorry still unable to draw this out on a model diagram:
A has $900 more than B. A gave B some money. In the end B had $880 (as not $800 as previously stated more than A. How much did A give B? :?

Can you advise, thank you

[MathIzzzFun]

Chan09:

Hi Tianzhu,


Sorry still unable to draw this out on a model diagram:
A has $900 more than B. A gave B some money. In the end B had $880 (as not $800 as previously stated more than A. How much did A give B? :?

Can you advise, thank you

Hi

the MD..

http://i45.tinypic.com/2hzs5xx.png\">

cheers.

[Mr OK]

Hi MathIzzzFun, thank you very much for helping me with the 3 questions I posted yesterday. After reading some earlier posts, I understand that there are numerous methods to solve any problem sum. So other than model drawing, is there any other method for these 3 questions that u could share. Thanks once again.

[kklau]

Hi, MathIzzzFun, Councillor,


Many thanks to your quick solution.

:thankyou:

[Mr OK]

Hi all, I know it’s crucial to decide fast which method or which concept to apply to answer questions during exams. My ds is quite weak in this aspect. Are there any standard way of analyzing or identifying the questions given? Thanks.

[tianzhu]

Chan09:

Hi Tianzhu,


Sorry still unable to draw this out on a model diagram:
A has $900 more than B. A gave B some money. In the end B had $880 (as not $800 as previously stated more than A. How much did A give B? :?

Can you advise, thank you

Hi

Good Morning.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7116/7147048583_8af489014b_z.jpg\">