Q&A - P4 Math

[heyhoe]

Hi Sun_2010,


Thanks for your reply.

I can't seem to click on \"Add to Post\" button as the TinyPic.com is right on top of it. Thus, when I click it went straight to TinyPic.com instead.

Also I don't quite understand on \"Or you can copy and paste the line above it.\" Where is the line? :oops:

[Jamesbond]

heyhoe:

Hi Sun_2010,


Thanks for your reply.

I can't seem to click on \"Add to Post\" button as the TinyPic.com is right on top of it. Thus, when I click it went straight to TinyPic.com instead.

Also I don't quite understand on \"Or you can copy and paste the line above it.\" Where is the line? :oops:

Hi

Firstly click on choose file, then click upload now, then click add to post....finally submit....

[Jamesbond]

http://i45.tinypic.com/2hpriiv.jpg\">


Hi Help me solve this....Thx.

[smartmummy]

Jamesbond:

http://i45.tinypic.com/2hpriiv.jpg\">


Hi Help me solve this....Thx.

a) my son did using guess and check method
7*7 5*5 24
ans:5m
b) he said the length of dotted stripe is same as the length of square.but i feel its more than that.do u have the answer?
is ans 8m2?

[Jamesbond]

smartmummy:

Jamesbond:

http://i45.tinypic.com/2hpriiv.jpg\">


Hi Help me solve this....Thx.

a) my did using guess and check method
7*7 5*5 24
ans:5m
b) he said the length of dotted stripe is same as the length of square.but i feel its more than that.do u have the answer?
is ans 8m2?

This question is from Henry Park PS Sa2 2009.
Ans given is
a)5m
b)8m2

[Jamesbond]

A wooden block of side of 4cm was cut into 8 smaller cubes of side of 2cm. If 1 litre of paint is required to paint the uncut wooden block, how many litres of paint is needed to paint the 8 smaller cubes?


Pl help…

[smartmummy]

Jamesbond:

A wooden block of side of 4cm was cut into 8 smaller cubes of side of 2cm. If 1 litre of paint is required to paint the uncut wooden block, how many litres of paint is needed to paint the 8 smaller cubes?


Pl help...

area of uncut cube is 4*4*6=96cm2
area of eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.

ans by ds

[Jamesbond]

smartmummy:

Jamesbond:

A wooden block of side of 4cm was cut into 8 smaller cubes of side of 2cm. If 1 litre of paint is required to paint the uncut wooden block, how many litres of paint is needed to paint the 8 smaller cubes?


Pl help...

area of uncut cube is 4*4*6=96cm2
area of eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.

ans by ds

:thankyou:

[Jamesbond]

smartmummy:

Jamesbond:

A wooden block of side of 4cm was cut into 8 smaller cubes of side of 2cm. If 1 litre of paint is required to paint the uncut wooden block, how many litres of paint is needed to paint the 8 smaller cubes?


Pl help...

area of uncut cube is 4*4*6=96cm2
area of eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.

ans by ds

A doubt again...Why did u multiply by 6 in the first step? :? Pl explain me....Thx.

[smartmummy]

as the wooden block is a cube it has 6 faces.that is why we have to multiply the area of one face times 6.

Jamesbond:

smartmummy:

[quote=\"Jamesbond\"]A wooden block of side of 4cm was cut into 8 smaller cubes of side of 2cm. If 1 litre of paint is required to paint the uncut wooden block, how many litres of paint is needed to paint the 8 smaller cubes?


Pl help...

area of uncut cube is 4*4*6=96cm2
area of eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.

ans by ds

A doubt again...Why did u multiply by 6 in the :thankyou: first step? :? Pl explain me....Thx.[/quote]