Q&A - PSLE Math

[Vanilla Cake]

Q11 and answer given : 54720 cm2

http://i51.tinypic.com/34s2yw4.png\">

posted by VC's mum

[Vanilla Cake]

http://i55.tinypic.com/suzriw.png\">


Solution given by supplier:

14)a)28+8=36
36+9=45
45+10=55

b)100÷2=50
99x50=4950
4950+1=4951

Posted by VC's mum

[tianzhu]

Hi VC’s mum


For Q14,the answers you gave are for (b) and .

The answer for (a) -------- 16,17,18,19,20,21.

For part (b) the answer is 55

For part , the answer is 4951.

Best wishes

[MathIzzzFun]

Vanilla Cake:

http://i55.tinypic.com/suzriw.png\">


Solution given by supplier:

14)a)28+8=36
36+9=45
45+10=55

b)100÷2=50
99x50=4950
4950+1=4951

Posted by VC's mum

Hi

... the workings..

http://i54.tinypic.com/2udwaya.jpg\">

cheers.

[tianzhu]

Vanilla Cake:

Q8 and answer given: 72 cm2

Hi

I made a guess on the locations of E, F and G as they are covered in dark shades.

I did a quick check and got an answer of 75.

Best wishes

[Vanilla Cake]

Vanilla Cake:

Q8 and answer given: 72 cm2

tianzhu:

In made a guess on the locations of E, F and G as they are covered in dark shades.
I did a quick check and got an answer of 75.

Hi tianzhu,
Thks for pointing out and your answer is correct. 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.Sorry that VC had made a typo error as she had to rush to go to school, this morning. Here's the solution by the supplier:

ΔBCD = 1/2
ΔBDH = 1/2 x 1/4 = 1/8
ΔAGB = 1/4
ΔAGF = 1/4x1/3 = 1/12
ΔAGD = 1/4
ΔDGE = 1/4x1/2= 1/8
1/8+1/12+1/8= 1/3
1/3x15x15 = 75 cm2

VC's mum

[kavisuresh]

pls help to solve qn 15 .

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

[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]

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.