Q&A - PSLE Math

[bobsg01]

MathIzzzFun:

bobsg01:

Need some engligtenment on this answer.


In Total number of parts the figure has is 2 + 9 = 11 units

Why does it used 9 instead of 8 with minus 1 for Z? Confusing because they used 2 for X (which is minus 1 instead of 3). :?

Thanks for your kind assistant.

http://i53.tinypic.com/cltf5.jpg\">

http://i52.tinypic.com/2ivffh0.jpg\">

Hi bobsg01,

The ratio of the areas, A : B : C = 3 units : 4 units: 9 units, so 9 units is the total area of Z.

cheers.

Hi MathIzzzFun, how about total area of X, isn't the area 3 instead of 2.

[MathIzzzFun]

bobsg01:

MathIzzzFun:

[quote=\"bobsg01\"]Need some engligtenment on this answer.


In Total number of parts the figure has is 2 + 9 = 11 units

Why does it used 9 instead of 8 with minus 1 for Z? Confusing because they used 2 for X (which is minus 1 instead of 3). :?

Thanks for your kind assistant.

http://i53.tinypic.com/cltf5.jpg\">

http://i52.tinypic.com/2ivffh0.jpg\">

Hi bobsg01,

The ratio of the areas, A : B : C = 3 units : 4 units: 9 units, so 9 units is the total area of Z.

cheers.

Hi MathIzzzFun, how about total area of X, isn't the area 3 instead of 2.[/quote]Hi bobsg01,

I have redrawn the figure into model diagram, hope it helps

http://i56.tinypic.com/mhtw0g.jpg\">

cheers.

[bobsg01]

Wow, it's easier to explain to my son now with this model diagram.


Thank you MathIzzzFun. :salute:

[Dharma]

bobsg01:

Need some engligtenment on this answer.


In Total number of parts the figure has is 2 + 9 = 11 units

Why does it used 9 instead of 8 with minus 1 for Z? Confusing because they used 2 for X (which is minus 1 instead of 3). :?

Thanks for your kind assistant.

http://i53.tinypic.com/cltf5.jpg\">

http://i52.tinypic.com/2ivffh0.jpg\">

Ratio of X : Y : Z = 3 : 4 : 9
Ratio of Y (Shaded) : Y(Unshaded) = 1 : 3
Ratio of X (Shaded) : X (Unshaded) = 1 : 2
Total area of figure = 2u +1u + 3u + (9u – 4u) = 11u
Total area of shaded portion = 1u
Fraction of unshaded portion = (11u -1u)/11u = 10/11

[bobsg01]

Thanks Dharma for alternative solution. :hi5:

[bobsg01]

Math problem.


Appreciate any kind help.

Thanks. :faint:

http://i55.tinypic.com/2cnfihj.jpg\">

[MathIzzzFun]

bobsg01:

Wow, it's easier to explain to my son now with this model diagram.


Thank you MathIzzzFun. :salute:

Hi bobsg01,

u r welcome, bon weekend !

cheers.

[MathIzzzFun]

bobsg01:

Math problem.


Appreciate any kind help.

Thanks. :faint:

http://i55.tinypic.com/2cnfihj.jpg\">

Hi bobsg01,

hope this helps

http://i52.tinypic.com/346rgnp.jpg\">

bon weekend !

cheers.

[bobsg01]

Fantastic solution and it's super clear. Thank you and happy weekend MathIzzzFun. :goodpost:

[bobsg01]

PSLE past examination question. Stuck.......


Appreciate for the kind help.

http://i56.tinypic.com/2e4dgud.jpg\">