Q&A - PSLE Math

[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.

[sexymama]

pls help me....


(1) On the way to SV town, Hans overtook Chris when they
were 120 km from SV.
When Hans reached SV, Chris still had 20 km to travel.
Chris finally arrived at SV 15 minutes later.
(a) Find Chris' average speed
(b) Find Hans' average speed

(2) Town A and Town B were 1080 km apart.
At 7 a.m. Mr Tan started driving from Town A to Town B.
At the same time, Mr Hamid started driving from Town B
to Town A at a speed 10 km/h faster than Mr Tan's.
At 12 noon, they were 180 km apart.
Find Mr Hamid's speed if they were travelling at constant speeds.

[Vanilla Cake]

sexymama:

(1) On the way to SV town, Hans overtook Chris when they were 120 km from SV. When Hans reached SV, Chris still had 20 km to travel. Chris finally arrived at SV 15 minutes later.

(a) Find Chris' average speed
(b) Find Hans' average speed

15 min-> 20 km
1 h -> 80 km

(a)Chris average speed was 80 km/h.

Required time for Chris to reach SV town = 120÷80 = 1½h
Required time for Hans to reach SV town = (1½-¼)h = 1¼h
120km÷1¼h = 96 km/h

(b) Han's average speed was 96 km/h

[Vanilla Cake]

sexymama:

(2) Town A and Town B were 1080 km apart. At 7 a.m. Mr Tan started driving from Town A to Town B. At the same time, Mr Hamid started driving from Town B to Town A at a speed 10 km/h faster than Mr Tan's. At 12 noon, they were 180 km apart. Find Mr Hamid's speed if they were travelling at constant speeds.

Assume that constant speed of Mr Tan be u km/h
Constant speed of Mr Hamid = (u+10)km/h
From 7 am to 12 noon, time lapsed = 5 hours
Distance travelled by Mr Tan = 5u
Distance travelled by Mr Hamid = 5(u+10) = 5u+50
Distance apart between them was 180 km and total distance between Town A and Town B was 1080 km,

5u+180+5u+50=1080
10u+230=1080
10u = 850
u = 85

85+10 = 95
Constant speed of Mr Hamid = 95 km/h

Hope this helps.