Q&A - PSLE Math

[tianzhu]

Vanilla Cake:

The question itself is not clear and you have to strain your eye to look for the locations of E, F and G in the paper.
VC's mum

Hi VC’s mum

Maybe, the original question is in better shape.

If we add the gridlines for the squares, the solution becomes clearer. We can even work in terms of units.

Best wishes

http://farm7.static.flickr.com/6030/6191262474_3e95fbb4bd_z.jpg\">

[Alchemist]

tianzhu:

vidhyalog:

Thanks Tianzhu. Could I find out though - why is it that the bigger square would have an area that is 2X the area of the smaller square? Pardon my ignorance ..... would like to work it out myself, but in the interest of time - taking short cut of asking you.

Thanks in advance

Hi

Here's the slide, it'll help to explain why the big square is 2 times the area of the small square.

Best wishes.

http://farm7.static.flickr.com/6151/6191262010_71cc0ec1fd_z.jpg\">

Tianzhu and Mathsizzfun - thank you so much for your explanation. I find it so admirable that you spend so much effort to explain things. Thank you again.

[tianzhu]

Vanilla Cake:

Q11 and answer given : 54720 cm2

posted by VC's mum

Hi VC's mum

I believe you just want to check the answer.It is correct.

Best wishes

[tianzhu]

kavisuresh:

pls help to solve qn 15 .

http://orlesson.com/10Ma/2010-P6-Math-SA2-Rosyth.pdf
thanks.

Hi

If it is Q15 from P2,this was discussed previously.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=1970

Best wishes

[tianzhu]

Hi VC’s mum


I believe you just want to check the answers.

I have the same answers for Q15 -18.

Best wishes

[Vanilla Cake]

Hi tianzhu,


Yes, you are right. No need to post worked solutions for these questions. Your slide presentation on Q8 is wonderful and I really enjoy your creativity.
Thks and best wishes.

VC’s mum

[nsmom]

Please help… urgently

Ning and Zong jogged to and fro repeatdly along a straight path in a park between two poins A and B. Ning jogged at a uniform speed of 4 m/s and Zong jogged at a uniform speed of 6 m/s. They started jogging from opposite directions at the same time as shown below.



Ning >>> <<<<<<Zong



A-----------------------------/----------------------------------------/------------------------------------------B

X Y



They first met one another at point X. The second line they met was at point Y.

a) Given that the distance between X and is 160m. Find the distance between A and B.

b) If they started jogging at 8 a.m., how long did they take to meet again for the third time?

Rosyth PLIM (2008)

[nsmom]

Anyone has answer key for Catholic high Plim 2010 paper 2? please post if you have one. Thx in advance and best of luck to all our kids…

[tianzhu]

nsmom:

Anyone has answer key for Catholic high Plim 2010 paper 2? please post if you have one. Thx in advance and best of luck to all our kids..

Hi

For CHS 2010 Maths, please go to this link.

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

Best wishes

[tianzhu]

nsmom:

Please help... urgently

Ning and Zong jogged to and fro repeatdly along a straight path in a park between two poins A and B. Ning jogged at a uniform speed of 4 m/s and Zong jogged at a uniform speed of 6 m/s. They started jogging from opposite directions at the same time as shown below.



Ning >>> <<<<<<Zong



A-----------------------------/----------------------------------------/------------------------------------------B

X Y



They first met one another at point X. The second line they met was at point Y.

a) Given that the distance between X and is 160m. Find the distance between A and B.

b) If they started jogging at 8 a.m., how long did they take to meet again for the third time?

Rosyth PLIM (2008)

Hi

As in any Speed type of question, start with a simple diagram. As you need it urgently, I’ll give you some pointers.

Speed

Ning:Zong ------- 4:6 --------2:3

Distance

Ning:Zong ------ 2:3

Draw a line and divide into 5 units.

Ning moves 2 units and Zong moves 3 units.
Distance between A and B ------ 5 units

2 units ------ 160
1 unit -------80

5 units ------- 400

They meet at an interval of 400/ (4+6) or 40 seconds.

Move Ning (2 units)and Zong(3 units) at intervals of 40 seconds along the line.

They meet at 40s(first time), 120s(second time) and 200s(third time).

200/60 -------- 3minute 20 seconds

Best wishes