Q&A - PSLE Math
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kiasiparent:
Indeed. Think too hard under a short time. Do you how many P6 kids had sacrificed their social and quality learning time this year, for MONTHS (some even YEARS), just to realise that their PSLE consists of a bunch of unrealistically set questions?For this question, you have to make one assumption and that is both start off the race at the same start line and at the same time.
Hmmm, in the past, PSLE exams were straight forward and all doubts are cleared before they approved the questions to be set. Now, the questions are deliberately set to make the students think hard.
Yes, I say unrealistic since even most of the GEP kids could not even confirm their answer for the last 4 questions. I mean, up till now, have you heard of any parent or student who have said \"I can confidently score Paper 2 this time\" ?
If you haven't, then I think the setters have gone too far beyond what even the smartest brainiest 12-year-old kid in SG can go. Not a fair test I say.
I won't be surprised if some of our maths whizzes would stop pursuing their interest in the subject altogether after this paper. Have the authorities even thought of it? Is assessment, not interest, the number one thing on everyone's minds in SG? -
MummyJamie:
PSLE Maths 2009 Paper 1 Q29 (Not in exact words)Ohh! And for paper one, the second last question, the computer one, what did ya'll get?
I got 100 minutes. Many are saying it's 25.
o_o
6 friends decided to rent computers from 2 to 4.30 pm.While 4 of them were playing, the other 2 would watch.If the cycle continued, how much playtime would each person get?\t
Suggested solution
From 2 pm to 4.30 pm -> 2 h 30 min = 150 min\t\t
4 x 150 = 600 (Total for 4 computers since there were 4 players)\t\t
600 / 6 = 100 min\t\t
Amount of playtime that each person get was 100 min -
gifted_indian:
Indeed. Think too hard under a short time. Do you how many P6 kids had sacrificed their social and quality learning time this year, for MONTHS (some even YEARS), just to realise that their PSLE consists of a bunch of unrealistically set questions?
Yes, I say unrealistic since even most of the GEP kids could not even confirm their answer for the last 4 questions. I mean, up till now, have you heard of any parent or student who have said \"I can confidently score Paper 2 this time\" ?
If you haven't, then I think the setters have gone too far beyond what even the smartest brainiest 12-year-old kid in SG can go. Not a fair test I say.
I won't be surprised if some of our maths whizzes would stop pursuing their interest in the subject altogether after this paper. Have the authorities even thought of it? Is assessment, not interest, the number one thing on everyone's minds in SG?
That is absolutely true ! I fully agreed. -
Tang:
Wow, Tang, still hard to believe you're only in secondary school. You are one of the best maths sums solvers on this site! Kudos to you!Sorry to have mixed up Lin and Mei and confused you as I solved the problem the previous day and I have just completed my SA2.
Let me start all over again.
When Lin cycled from start to mid-point,
Mei completed the same distance + 3.5 km.
To cycle the 3.5 km, Mei took 10.5 min. [3.5 km /20 km/h x 60 min/h]
That is, Mei reached the mid-point 10.5 min earlier than Lin.
Conversely, Lin reached the mid-point 10.5 min later than Mei.
Since for half the distance Lin cycled and both cycling at constant speed, he was 10.5 min slower, so for the whole distance Lin would be 21 min slower than Mei. [10.5 min x 2]
Hence Lin reached the finishing line later than Mei by 21 min, i.e. 11.06 a.m. [21 min past 10.45 a.m.]
Have a nice weekend. Bye.
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Tang:
Hi Tang,My answer was to move Lim back to the mid-point, hence Mei also had to be moved backwards corresponding. As timeframe was unchanged, it would mean that Mei would take 10.5 minutes more to travel from where she was moved back to to the mid-point. Hence when Lim had completed the race, she would need a total of 21 minutes to reach the finishing line.
Same as my tutor's solution, Kiasuparent has assumed that Lim had continued with his cycling at the costant speed of 20 km/h. Lim travelled another 21 minutes at 20 km/h before Mei finally finished her cycling. [There was no increase in speed for Lim.]
Though your answer is correct, can you shed some light on HOW you know that Lin's speed was (would become) 20km/h, as in the question, they said that their speeds are not changed, and if you draw a timeline, or even look at the question, Lin is ALWAYS slower than Mei. So can you please tell me how both of their speeds are 20km/h if what I said above is true? Thanks. -
Removed - housekeeping
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Tang:
Please ignore this posting as I have mixed up Lin and Mei. You may refer to my latest posting or the posting at 1800-teacher. Sorry to have caused the confusion. δΈδΈδΈͺε―ΉδΈθ΅·.
It's fine, Tang.
Can understand now.
Thanks!
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N3SKiasu:
The Speed question (if my DD remembered correctly):
Mei and Lin take part in a cycling race.
Mei's speed is 20km/h. When Lin travelled half of the distance, Mei was 3.5km in front of her.
Mei reached finishing line at 10.45am.
What time did Lin reach the finishing line?
Similar feedback - paper was tough, finished all but not a lot of time left to check through. Anyway, its over now, just move on and focus on next few papers.
Hipe! I Am A P6 Student This Year And I Thought The Paper Was Quite Ok. Basically, The Ratio And Angle Sum Is The Hardest And As For This Speed Question (Above) The Answer Is 11.06a.m. You Can Study Some Of The Question @ http://www.psle2009.blogspot.com this Website Is From James Ang And Do Encourage Your Children That They Will Not Do That Badly As it is based on national avg. Good Luck! -
Piratednoob:
You don't type like a P6 student
Hipe! I Am A P6 Student This Year And I Thought The Paper Was Quite Ok. Basically, The Ratio And Angle Sum Is The Hardest And As For This Speed Question (Above) The Answer Is 11.06a.m. You Can Study Some Of The Question @ http://www.psle2009.blogspot.com this Website Is From James Ang And Do Encourage Your Children That They Will Not Do That Badly As it is based on national avg. Good Luck!
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mrswongtuition:
How do P6 students type? I'm a P6 student too.
You don't type like a P6 studentPiratednoob:
Hipe! I Am A P6 Student This Year And I Thought The Paper Was Quite Ok. Basically, The Ratio And Angle Sum Is The Hardest And As For This Speed Question (Above) The Answer Is 11.06a.m. You Can Study Some Of The Question @ http://www.psle2009.blogspot.com this Website Is From James Ang And Do Encourage Your Children That They Will Not Do That Badly As it is based on national avg. Good Luck!
[quote]Mei and Lin take part in a cycling race.
Mei's speed is 20km/h. When Lin travelled half of the distance, Mei was 3.5km in front of her.
Mei reached finishing line at 10.45am.
What time did Lin reach the finishing line? [/quote]Is the answer 7:06am? That's what I wrote. I did it this way:
When Lin reaches the finishing line, Mei [if she continues cycling even after she reaches the finishing line] would have cycled 7km past the finishing line. [3.5km x 2] So how long does Mei take to cycle that 7km? Well, basically, 21mins. [7km divided by 20km/h] Anyone care to tell me if it's correct?
And I agree completely - it was a hard paper. Left the last two questions blank, did the rest though.
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