PSLE Math Qns

[Simplyme]

I dono how to solve anyone noes?

 

Taken from http://www.straitstimes.com/Free/Story/STI...62.html?vgnmr=1

[RadX]

i onchi K2 ellucatioin....never proceed to stulee...so i dunch kno

 

[Gabriel]

is the answer to a) 14??

me still working on the other 2 though

[Hctan]

Wau lau, sibeh cheem My boy will be taking PSLE in 2 years time, really worry for him

[Rayleigh]

For Q1: 156-X = 4(72-X)

 

For Q3: 60*40*50=X*40*(50+70)

 

For Q2: A little tough though. Need some time to think

[Comfy]

don't worry too much about it la.. i'm sure if your boy is well prepared then it should not be a big problem..

[Porker]

Quite simple to solve right?

 

1st one:

 

(156 - x)/(72 - x) = 4

 

x = 44kg

 

2nd one:

 

6x/14 = x/2 - 112

 

x =1568 chairs

 

3rd one:

 

total volume = 0.12 cubic metres

 

so 0.5(0.4x) + 0.7(0.4x) = 0.12

 

x = 25cm

[Hctan]

Hopefully lor

[Simplyme]

I m not very sure but i believe porker is rite

[Porker]

the answer is flipped over at the end of the attachment but its the process of getting it that is important... anyway.. got more to share anot?

[Andyy2]

Think we can't use algebra for PSLE questions. Dun think Algebra was taught in Primary sch ... but these questions very chimp.

Edited October 22, 2007 by Andyy2

[Simplyme]

i think they oli post out 3 qns ... porker ur math v gd hor

[Porker]

Really? Thought they started teaching algebra already? Anyway who cares

 

I'm out of it already

[Simplyme]

PSLE no algebra meh I tot have Primary sch maths oso v chem now

[Unic]

For Q1: 156-X = 4(72-X)

 

For Q3: 60*40*50=X*40*(50+70)

 

For Q2: A little tough though. Need some time to think

 

I don't think they are allowed to use variable. That's the tough part.

[Porker]

Which method they teach then?

[Andyy2]

Dun see any algebra in their text few years back when i trying to teach my nephew. dun tell me they had introduce for our poor kids now...

[Hiphiphoray]

Quite simple to solve right?

 

1st one:

 

(156 - x)/(72 - x) = 4

 

x = 44kg

 

2nd one:

 

6x/14 = x/2 - 112

 

x =1568 chairs

 

3rd one:

 

total volume = 0.12 cubic metres

 

so 0.5(0.4x) + 0.7(0.4x) = 0.12

 

x = 25cm

 

they are not allow to use algerbra to solve these problems....so your x,y,z solutions will be rejected. I think they draw boxes and stretches to solve it.