Q&A - P4 Math
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Jamesbond:
a) my son did using guess and check method![](\"http://i45.tinypic.com/2hpriiv.jpg\")
http://i45.tinypic.com/2hpriiv.jpg\">
Hi Help me solve this....Thx.
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? -
smartmummy:
This question is from Henry Park PS Sa2 2009.
a) my did using guess and check methodJamesbond:
Hi Help me solve this....Thx.
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?
Ans given is
a)5m
b)8m2 -
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… -
Jamesbond:
area of uncut cube is 4*4*6=96cm2A 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 eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.
ans by ds
-
smartmummy:
:thankyou:
area of uncut cube is 4*4*6=96cm2Jamesbond:
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 eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.
ans by ds -
smartmummy:
A doubt again...Why did u multiply by 6 in the first step? :? Pl explain me....Thx.
area of uncut cube is 4*4*6=96cm2Jamesbond:
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 eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.
ans by ds -
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:
A doubt again...Why did u multiply by 6 in the :thankyou: first step? :? Pl explain me....Thx.[/quote]
area of uncut cube is 4*4*6=96cm2smartmummy:
[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 eight cubes is 2*2*6*8=192cm2
192/96=2
96cm2 -------- 1liter
192cm2 needed 2 liters.
ans by ds -
:thankyou: Smartmummy.
-
![](\"http://i49.tinypic.com/2j1sfb5.jpg\")
Pl help.... -
Jamesbond:
10
Pl help....
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