Q&A - PSLE Math

[ck123]

:thankyou: vanilla cake


How did you manage to attach the picture?

[Daddy]

Thanks MathIzzzFun

[/quote]
Q2.

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cheers.[/quote]

How did you get 3: 2 ratio of Mary to John?
How about John bought 40% of the totalnumber of clips and ribbons?

I am not quiet understand. Sorry for that.

[tianzhu]

Hi


Hope this helps.

Best wishes.

http://farm7.static.flickr.com/6196/6126196951_0dc89c875a_z.jpg\">

[michyms]

tianzhu:

ozora:

now i tried it on the this following question: but i got stuck. can U see where i go wrong?
Ashley and Bee shared a sum of money. If Ashely spend $10 each day and Bee spend $20 each day, Ashely would have $250 left while Bee would have spend all her money. If Ashely spend $20 each day and Bee spend $10 each day, Ashely would have $10 left while Bee would have spend all her money. How much money did they have resepctively?

Case 1:
A -1 unit +250
B- 2 units
Assuming 1 unit - $10

case 2:
A- 3 unit +10
B- 2 units

2 units= 250-10 =240
1unit -120
a- 360
the answer is wrong.

Hi

There is an error as highlighted. It should be read as 4 units + 10

1 unit ---- 80

Ashley ----- 330
Bee ----- 160

Best wishes

tianzhu, can you explain how you assigned the units? I'm a little confused. Thanks.

[tianzhu]

Hi


A quick one for Q17, sorry no time to draw now.

You need to do some rearrangement of figures

Radius of semi circle ---- 11.75 cm.

Area of two squares ----- 11.7511.75 -----138.06sqcm

Breadth of rectangle ----- same as radius of semi circle ------11.75

Length of rectangle -----11.752

Perimeter of S and T ------ circumference of semi circle + (11.754) ------(pi11.75) + 47 ------83.91cm

(use calculator pi)

Best wishes

[ck123]

:thankyou: tianzhu


Can u help to explain how to see Radius of semi-circle is 11.75 :scratchhead: for Q17

How about RGS 2011 Prelim Paper 2 Question 14b and 15.

You are great :udaman:

[ck123]

Master Tian zhu


i managed to solve Q15 but not Q14b yet

[tianzhu]

michyms:

Thank you tianzhu!

Hi

You’re welcome.

Best wishes

[tianzhu]

michyms:

tianzhu, can you explain how you assigned the units? I'm a little confused. Thanks.

Hi

That reply was to address ozora’s query.It lacked details.

A similar type of question was discussed in an earlier post.

Please follow this link.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=2920
page 293@Wed Apr 13, 2011 9:07 am

Best wishes

[tianzhu]

ck123:

Master Tian zhu


i managed to solve Q15 but not Q14b yet

Hi

You’re welcome.

Paiseh, please do not address me as master, I am just an ordinary dad.

I am sorry, I don’t have a set of 2011 test papers as I am a post PSLE dad.

Please post the questions if you need clarification.

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