Q&A - PSLE Math

[MathIzzzFun]

Bunny27:

Hi, can someone pls help on this question


1. Habri had some 20cents coins and 50cents coins.
He spent 1/4 of his 20cents coins and 40% of his 50cents coins.
The value of 20cents coins left was the same as the value of 50cents coins left. If the difference between the value of 20cents coins and the value of 50cents coins he had at first was $12, how much did Habri have at first?

TIA

3/4 of value of 20-cent coins = 3/5 of value of 50-cent coins
At first,
value of 20-cent coins : value of 50-cent coins --> 4u : 5u -- total value --> 9u
1u --> $12
Total amount of money Habri had at first --> 9 x $ 12 = $108

cheers.

[tianzhu]

Hi girl


Good Morning.

For Q2, it’s an interesting question.

You may solve it with strategies taught in your school.

1) Systematic Listing
2) Observe the pattern.

Now, tweak the question a bit if you want to try something new, instead of forty page newspaper, use a twenty six-page newspaper.

A twenty six- page newspaper, which consists of only one section, has a sheet with page 9 and page 10 missing. What other pages are missing?

For your easy reading, I’ve added in the solution for the cards posted yesterday.

Have a smooth journey towards PSLE 2012.

Best wishes

http://farm8.staticflickr.com/7126/7843764404_24a76a1abb_z.jpg\">

http://farm9.staticflickr.com/8440/7836643020_0af55760ca_z.jpg\">

[Tiramisu Coco]

tianzhu:

Tiramisu Coco:

Hi, pls help with this qtn. Thks!


http://m.flickr.com/photos/82618212@N07/7837766706/lightbox/

Hi

A similar question has been discussed in one of the earlier posts, but I can't locate it now.

There are a few ways to solve it.

One possible way.

Radius of circle -------( a+b-c)/2 -------(18+24-30)/2 ------ 6 cm

Best wishes

Hi Tianzhu, thks for your reply.
This qtn has not been discussed before, think u refer to the wrong qtn on the photostream. It's the last item abt ABCD is a square of 20cm. E & F are the mid-points of AB & AD. Find area of shaded region.
Would appreciate your help for this qtn. TIA

[tianzhu]

Tiramisu Coco:

Hi Tianzhu, thks for your reply.

This qtn has not been discussed before, think u refer to the wrong qtn on the photostream. It's the last item abt ABCD is a square of 20cm. E & F are the mid-points of AB & AD. Find area of shaded region.
Would appreciate your help for this qtn. TIA

Hi

When I clicked on your link, all I could see was a circle inscribed in a triangle.

Based on your description, perhaps this question may help.

Q15 of this paper, please go to page 35 of this link.

http://www.orlesson.org/orp/10Ma/2010-P6-Math-SA2-Rosyth.pdf

Best wishes.

http://farm5.staticflickr.com/4103/5037820252_8aa41e056c_z.jpg\">

[tianzhu]

Robertpattinsonidle:

Please help me. how to solve these types of qsns? http://i47.tinypic.com/65v0aw.jpg\">

Hi

Questions on \"nets\" are pretty challenging.

I am more inclined to go for (3).

Best wishes

[kuts]

A B C D


2 3 4 5
9 8 7 6
10 11 12 13

If this pattern continues, in which column will number 801 appear?

Please help!

[tianzhu]

kuts:

A B C D


2 3 4 5
9 8 7 6
10 11 12 13

If this pattern continues, in which column will number 801 appear?

Please help!

Hi

It'll appear in column (A).

Try to establish the pattern first.Rows with even numbers will be in column A.

(Row number *4 + 1)

Best wishes

[kuts]

Thank you tianzhu. MY DD’s answer was also A. Tks for the prompt reply

[kuts]

Hi Tianzhu, cld you pl help me solve this sum as well


18x cents when converted to dollars is $_____________

Tks in advance

[charsen]

kuts:

Hi Tianzhu, cld you pl help me solve this sum as well


18x cents when converted to dollars is $_____________

Tks in advance

The answer is $0.18x.When it comes to dollars,shift the decimal point two times regardless of x.Thus,the answer is $0.18x.