Q&A - PSLE Math

[Suz855]

Alan, Benny, Clement and Danny had 105 marbles. Alan lost 3 marbles and Danny lost half of what he had. Benny's sister gave Benny another 6 marbles. Clement's aunt rewarded Clement by doubling what he had originally. In the end, the 4 boys had an equal number of marbles. How many more marbles than Danny did Alan have at first?


Is the qn looking for a comparison between Alan at first with Danny after he lost half of his marbles? Based on the qn, Danny should have more marbles than Alan at first, thanks

:?

[Tnsp]

http://www.postimage.org/image.php?v=aVS8f8S


The question is simply asking the student to solve for A, B, C and D, the number of marbles they had at first.

Danny definitely had more marbles than Alan. Danny had 48 while Alan had 27.

I think is not meaningful to ask Danny (after he lost half) 24, compared to Alan (at first) 27.

It is the way the question was written. I don't like it either, because it is very awkard. The English department teachers should help the Maths department teachers to check the question papers before they use it.

[firebird]

Dear Tianhu


Good afternoon.

The question and working posted by me on speed was from an assessment book.

I also thank Dharma for the clear solution.

With best regards
Firebird

[firebird]

Dear adhdadhd


Thank you for the solution.

With best regards
firebird

[Joy]

Hi All,


Good morning.

Below is a math question from my dd, p5 sa1 exam.I also noticed similar question came out in another school for p6 sa1 this year.

Just wonder, anyone has seen similar question before?If yes, kindly advice where is the source?

Mdm Lek had 57 apples and oranges altogether.There were 3 fewer oranges than apples.She gave away half as many oranges as apples to her neighbours.vShe was left with twice as many oranges as apples.How many apples did she give away?

thank you.Regards
Joy

[CoffeeCat]

Joy:

Hi All,


Good morning.

Below is a math question from my dd, p5 sa1 exam.I also noticed similar question came out in another school for p6 sa1 this year.

Just wonder, anyone has seen similar question before?If yes, kindly advice where is the source?

Theoretically this is not a very challenging problem. The concept tested is the \"more than/less than\" concepts as exemplified by books like onsponge or challenging maths problems made easy. I dun think you will find a exact similar question there.

Anyway I know this looks like or will remind people of another type of challenging problem sums called external transfer (could this be the one that you saw and very interested in?)
external transfer questions are usually more challenging because the exact quantities are not told (we know the number of apples and oranges in this question), only the ratios are given.

[Joy]

thanks.


Was trying to find out cos has never seen such question while practising the past year school papers.

Will take a look at the book that u mention.Thank you.

rgds
Joy

CoffeeCat:

Joy:

Hi All,

Good morning.

Below is a math question from my dd, p5 sa1 exam.I also noticed similar question came out in another school for p6 sa1 this year.

Just wonder, anyone has seen similar question before?If yes, kindly advice where is the source?

Theoretically this is not a very challenging problem. The concept tested is the \"more than/less than\" concepts as exemplified by books like onsponge or challenging maths problems made easy. I dun think you will find a exact similar question there.

Anyway I know this looks like or will remind people of another type of challenging problem sums called external transfer (could this be the one that you saw and very interested in?)
external transfer questions are usually more challenging because the exact quantities are not told (we know the number of apples and oranges in this question), only the ratios are given.

[atutor2001]

Joy:

Hi All,


Good morning.

Below is a math question from my dd, p5 sa1 exam.I also noticed similar question came out in another school for p6 sa1 this year.

Just wonder, anyone has seen similar question before?If yes, kindly advice where is the source?

Mdm Lek had 57 apples and oranges altogether.There were 3 fewer oranges than apples.She gave away half as many oranges as apples to her neighbours.vShe was left with twice as many oranges as apples.How many apples did she give away?

thank you.Regards
Joy

Hi Joy

This type of question can be found in many exam papers. The characteristic of such question is that the examiner has added one more working step by giving the actual number of apples and oranges \"indirectly\" - i.e. from the total of 57 and the difference of 3, students can find the actual no. of apples and oranges.

This additional working step can be incorporated into all kinds of questions involving 2 quantities but will usually leave students totally confused. I remembered telling my kids to specially look out for information given in this way (i.e. total with difference).

[Joy]

thanks, atutor2001.


Yes, I agreed and its this additional step that kids usually failed to see.I have yet to see this additional steps in the pri five past year paper and seems quite popular during this SA1 exam and that is the reason why am curious where is this question being taken out.I believe it should be one of the newer assessment book.thanks


rgds

Joy

atutor2001:

Joy:

Hi All,

Good morning.

Below is a math question from my dd, p5 sa1 exam.I also noticed similar question came out in another school for p6 sa1 this year.

Just wonder, anyone has seen similar question before?If yes, kindly advice where is the source?

Mdm Lek had 57 apples and oranges altogether.There were 3 fewer oranges than apples.She gave away half as many oranges as apples to her neighbours.vShe was left with twice as many oranges as apples.How many apples did she give away?

thank you.Regards
Joy

Hi Joy

This type of question can be found in many exam papers. The characteristic of such question is that the examiner has added one more working step by giving the actual number of apples and oranges \"indirectly\" - i.e. from the total of 57 and the difference of 3, students can find the actual no. of apples and oranges.

This additional working step can be incorporated into all kinds of questions involving 2 quantities but will usually leave students totally confused. I remembered telling my kids to specially look out for information given in this way (i.e. total with difference).

[CoffeeCat]

Joy:

Yes, I agreed and its this additional step that kids usually failed to see.I have yet to see this additional steps in the pri five past year paper and seems quite popular during this SA1 exam and that is the reason why am curious where is this question being taken out.I believe it should be one of the newer assessment book.thanks


rgds

Joy

I believe such questions should be popular for p6 and psle books. The school is merely taking a p6 question and putting it in a p5 paper just to stop students from feeling complacent. It's quite normal.