2010 PSLE Mathematics

[MOE Hater]

All answers have been posted in the PSLE Mathematics 2010 thread.

[kancheongmum]

Hi all


Finally 3/4 of the battle is over for those not taking higher chinese. DS said 3 papers were surprisingly easy. But very sad for Maths when he realised later he makes alot of careless mistakes. He said can kiss his A* goodbye. Indeed the Maths paper is easy, but in my opinion it takes one to be very focus and detailed to avoid pitfall. Some of the questions were about the same as past year PSLE questions with a bit of twist, eg P2 Q18, P1 Q28. The sweets question is the one they have seen since they were P4. For P2 Q17, at one glance it looks very complex. But yet one simple step if they realised the pattern from odd to even add 5 and from even to odd add 8, then they can work in group of 2. So the pattern increased in a regular interval of 13, and the height in interval of 3. So regular interval is very easy to work with. Tianzhu’s solution in the other thread is what I have in mind instead of complex algebra expressions. Yet under such stressful condition I don’t think most can think straight. DS left these 2 parts blank. I told him is OK, but just very upset over the silly and careless mistakes on the questions he had been practising. I dare not even say anything or show my unhappiness. Ren, Ren, Ren because he still has 2 more papers to go.

[snowman.022851697]

Your son take hmt arh?


btw i made careless mistakes too. I realised them when i was going through the paper the 3rd time. When i was correcting the first mistake invigilator said pens down )): Luckily i only lost 7 marks… but still, disappointing.

[kancheongmum]

Hi snowman.697


DS doesn’t take higher chinese. Just heard him on the phone with classmate about outing on Monday after Science paper. Guess he is not so upset after crying for 1 hour yesterday. Heng lah look very happy after the Chinese paper. Hope he can do well for Science to make up for the marks lost in Maths. You too focus on the next paper or 2 papers if you are taking higher chinese.

All the best

[snowman.022851697]

You said he has 2 more papers… anyway thanks for the support.

[Strparent]

Hi all,


appreciate all the efforts and sharing by all parents and children concerned. Like most forumers views, my DS also said, all of his classmates were shocked by the Maths paper being so relatively easier than they expected. Should be a bummer to the T score though.

The only question that is in doubt here, seems to be Q17c. The correct answer of either 782 ( majority get this one ) or 779 ( minority ). I guess the difference is in the information provided for the pattern itself. The dispute seems to derived from the number of rods for Structure 3 ( is it 25 or 28 ? )

We just have to wait for clarification on the pattern itself, I guess. Need to see the question to clear the air here.

Wish everyone the best of luck !!

After Tuesday, DS can finally 'touched' his computer again He deserves a nice break.

beauty queen:

for those who do not know how to do the pattern question here is my solution.


untill patern 3 , it increased by 8 right? After that it increases by five. Students may become pretty confused. when seeing this. Then it increases by 8 again. So it should increase by 5 for pattern 6 so it should be 46 rods. For height it increases by 3 after every even number (multiples of 2). So pattern 6 is : (6/2)x3 = 9 height for pattern 119 is

119-3=116 ( beacuse for the first three patterns it increases y 8 then it increases by 5 and 8 respectively)

116/2 = 58

So there are 58 5 rod cubes and 58 8 rod cubes.

58x5 + 58x8 = 754

Now you have to add 28 to it ( the total of the first three patterns)

754 +28=782

Dharma:

Structure Number Number of Rods Height (cm)\t\t\t\t\t
-------------------------------------------------------------\t\t\t\t\t
1 12 3\t\t\t\t\t
2 20 3\t\t\t\t\t
3 25 6\t\t\t\t\t
4 33 6\t\t\t\t\t
5 38 9\t\t\t\t\t
6\t\t\t\t\t
-------------------------------------------------------------\t
a) Fill in the number of of rods and height for structure 6. [1 mark]
b) Find the height of Structure 119. [2 marks]
c) Find the number of rods for Structure 119. [2 marks]


Q17 ( c )

119 is an odd number.
We can establish a pattern for the number of rods for Structure Numbers that are odd numbers.

Structure 1=> 12 rods = (12 x 1) + 0
Structure 3 => 25 rods = (12 x 2) + 1
Structure 5 => 38 rods = (12 x 3 ) + 2
Structure 7 => 51 rods = ( 12 x 4) + 3
.
.
.
Structure N => [12(N + 1)/2 ] + (N – 1)/2

So,
Structure 119 => 12(120/2) + (118/2) = 779 rods

[isooo_luvHEDLEY]

the kiasu student:

What do you think of the Math 2010 PSLE?

OK OK lah... i tot pr 1 very easy, so pr 2 will be hard! but pr 2 was... ok lah

[dericklee]

The maths paper super easy. I very annoyed -_-


I want a difficult paper.

[kiasiparent]

hashroop:

\"easy paper means lower T score..some parents pray for difficult paper\". Is this true? Heard from expert parents.

if you can get 100/100, how to get low t-score?

[CVPSMASH]

the kiasu student:

What do you think of the Math 2010 PSLE?

Okayokay.