Q&A - P4 Math

[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]

[Jamesbond]

:thankyou: Smartmummy.

[Jamesbond]

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Pl help....

[Sun_2010]

Jamesbond:

http://i49.tinypic.com/2j1sfb5.jpg\">


Pl help....

10

[Jamesbond]

Sun_2010:

Jamesbond:

http://i49.tinypic.com/2j1sfb5.jpg\">


Pl help....

10

:thankyou:

[dazzlego]

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

another way to solve is to count how many sides of 2cm x 2cm are there
uncut: 4 x 6 = 24
cut: 6 x 8 = 48
24 sides --> 1 L
48 sides --> 2 L

[Gold]

Hi,


Please help with the question below:-
In a class, 2/5 of the pupils liked golf and 7/9 of the remaining pupils liked tennis. The rest of the pupils liked soccer, how many pupils were there in the class altogether?

Thanks.

[Sharmum]

Hi,


Need help with this question.

Charlene and Denise have the same number of stickers. After Charlene gave away 16 stickers and Denise gave away 52 stickers, Denise has 1/3 as many stickers as Charlene. How many stickers did Charlene have at first?

Thank you!