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PSLE Maths question. How to solve?


Cooliechang
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Hypersonic

 

Swapping 2 tens for 2 twos would cause the number of tens to decrease by 2 and the number of twos to increase by 2.

 

I think this is where we interpret differently..

 

To me swap 2 tens to 10 twos to maintain the same value.   I guess the question wasn't specific. In most PSLE questions, they will specifically says the swap will maintain the  same value.

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(edited)

I think this is where we interpret differently..

 

To me swap 2 tens to 10 twos to maintain the same value. I guess the question wasn't specific. In most PSLE questions, they will specifically says the swap will maintain the same value.

Well, if that was the intent this was a terribly worded question or it wasn't transcribed properly here.

 

If I saw it written that way in the exam I would have gone with my reckoning. Simply because they didn't invoke the values of the notes till the last line.

Edited by Turboflat4
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Hypersonic

Well, if that was the intent this was a terribly worded question or it wasn't transcribed properly here.

having gone thru hundreds PSLE questions with my son last year. 99% of them will specifically word to says the the swap for same value. This question belongs to the one percent.

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(edited)

I would ask @Hiphiphoray to please post the original questions in their exact wording.

 

The funfair one was poorly phrased too, but the intent was possible to discern (unless you allow transgender students!).

Edited by Turboflat4
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Penty of schools' semester exams have lousy questions.

 

At least now we know there can be 2 answers....hehehe

 

I would ask @Hiphiphoray to please post the original questions in their exact wording.

 

The funfair one was poorly phrased too, but the intent was possible to discern (unless you allow transgender students!).

Can show model style workings?

 

Or does psle marking scheme accept such workings?

 

having gone thru hundreds PSLE questions with my son last year. 99% of them will specifically word to says the the swap for same value. This question belongs to the one percent.

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Hypersonic

Penty of schools' semester exams have lousy questions.

 

At least now we know there can be 2 answers....hehehe

 

 

Can show model style workings?

 

Or does psle marking scheme accept such workings?

 

The Us and Ps are accepted for PSLE, in fact is taught in P6.  But I don't know what they call it in school.. 

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The Us and Ps are accepted for PSLE, in fact is taught in P6. But I don't know what they call it in school..

Oh ic. Im now at p3 with my boy.

 

But oredi gone through enough to know all p3 maths liao.

 

Psle no need to know for now but its good to know from experts like you.

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Hypersonic
(edited)

Oh ic. Im now at p3 with my boy.

 

But oredi gone through enough to know all p3 maths liao.

 

Psle no need to know for now but its good to know from experts like you.

Oh P3, than no choice, have to use modelling, they are strict in using modelling for p3 and p4. Only in P5 onwards they will be shown the using of 'u' in place of drawing boxes. And by P6, they should have been taught to use two variables , 'u' and 'p' Edited by Ender
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A Pen costs 95 cents more than a Pencil

 

Catherine bought twice as many Pencils as Pens.

 

She spends a total of $53.60.

 

She spent $2.40 more on Pens than Pencils.

 

How many Pens did Catherine buy ?

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Total spending of pencils =(53.6 -2.4)/2 = $25.60

Total spending on pens = $25.60 +. 2.4 = $28

 

Since ratio of pencils : pens => 2:1

Pencils is 2u

Pens is 1u

 

1u of pencils cost= 25.6/2 = $12.80

1u of pens cost $28

 

Difference = 28 - 12.8 = 15.2

1u = 15.2/ 0.95 = 16

 

Pen is 1u = 16###

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Hi All

 

Anyone knows how to solve this P6 math question?

 

Is this really a PSLE question?

 

To solve this I think you will need to use the area of a sector and Pythagorean theorem which is beyond PSLE level.

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Unfortunately it is.

 

The answer is a quarter (0.25).

 

I used area of a sector to get the answer. I do not know of any other ways to solve it.

 

For PSLE standard, they only learned how to calculate area of a sector in a quarter (90 deg) or a semicircle (180 deg)

 

In your drawing, the angle of the sector is 120 deg and to get this 120 deg, I need to use cosine.

 

Definitely an O level type of question, not PSLE. 

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Hi All

 

Anyone knows how to solve this P6 math question?

 

 

Probably like this

 

unshaded A = 1/4

unshaded B = 3/12 = 1/4

total unshaded =1/4

 

post-172792-0-62737200-1470827804_thumb.jpg

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