2010 PSLE Mathematics

[desichan352]

Vanilla Cake:

Hi,

Pls help to check and verify the answers as I got them from http://thinkingmath.com.sg/forum/35-thinkingmathonsponge/5790-how-did-you-do-psle-math-2010.html. Take note that the questions are not in exact words as appeared in the PSLE 2010 Maths exams.

Paper 1
Q1.\t3
Q2.\t1
Q3.\t1
Q4.\t3
Q5.\t3
Q6.\t4
Q7.\t3
Q8.\t1
Q9.\t2
Q10.\t2
Q11.\t4
Q12.\t4
Q13.\t2
Q14.\t1
Q15.\t4
Q16.\t9 cm \t
Q17.\t113°\t
Q18.\t3 and 11/25\t
Q19.\t1 and 5/21\t
Q20.\t0.625\t
Q21.\t6.4\t
Q22.\t1550 ml\t
Q23.\t$ 49.20\t
Q24.\t1/4\t
Q25.\t10:6:3\t
Q26.\t30 %\t
Q27.\t4.5 km/h\t
Q28.\t75 cm\t
Q29.\t60\t
Q30.\t5/9\t

Paper 2
Q1
List all the common factors of 12 and 18.
Ans: 1, 2, 3, 6

Q2's answers
a) West
b) Directly above the \"Swing\"

Q3
Ans: $ 186.90

Q4
Ans: 48 cm²

Q5
Faizal and Gary were racing. Both of them did not change their speeds throughout the race. They started at the same time and the same place. When Gary reached the finishing line, Faizal had only run 5/8 of what Gary had run. Gary speed was 75m/min faster than Faizal. What was Faizal's speed in m/min?\t
Ans: 125 m/min

Q6
John had 1.2m of wire. He used some of it to form a figure as shown below. (Figure has 5 lines)\t\t
a) Find how much wire he used to form this figure.\t\t
b) If k=15, find the length of wire that he did not use.\t\t
Ans: (a) (6k+3) cm (b) 27 cm

Q7
The table below shows the number of books read by pupils in a class of 30.Find the average number of books read by the 30 pupils.\t
Ans: 12 books

Q8
When a jar is filled with 40 screws, the jar weighs 1.4kg. When the jar is filled with 20 iron nails, the jar weighs 500g.Each screw's mass is twice that of an iron nail. What is the mass of the jar when empty?
Ans: 200 g

Q9
Angle question
Ans: 78°

Q10
Two quadrants are cut out of a rectangular sheet of paper.
Ans: 5 cm

Q11
There are 320 marbles put into 4 different boxes. Box A has the most marbles whereas Box D has the least marbles...........
Ans: 71

Q12
A group of girls wants to take some sweets. If each girls takes 11 sweets, one of the girls will only have 6 sweets.If each girl takes 8 sweets, there will be 25 sweets left over. How many sweets are there?\t
Ans: 105 sweets

Q13
Geometry question
Ans: 118°

Q14
A person bought a pair of shoes and a bag. He spent $57.60 in total. The pair of shoes costs $9.60 more than the bag. He was given a total discount of $22.40 for the 2 items. A 25% discount was given for the bag.\t
(a)Find the cost of the pair of shoes.\t
(b) Find the percentage of discount given for the pair of shoes.
Ans: (a) $ 33.60 (b) 30%

Q15
(Based on graph)
(a) What fraction of the tank was filled after 4 minutes?
(b) How much water flows from Tap B in 1 minute?
Ans: (a) 1/7 (b) 3.75 litres/min

Q16
Nurul and Peili shared a sum of $60. Nurul spent twice as much as Peili. What Peili had left was $7 more than what she had spent. Peili had twice as much as Nurul in the end.
(a) How much did Peili spend?
(b) How much did Nurul have at first?
Ans: (a) $11 and (b) $31

Q17
Pattern/Structure
Ans:
(a) 46 and 9 (Filling in the 2 numbers in the box provided)
(b) 180 (height of structure 119)
(c) 782 (find the number of rods to form structure 119)

Q18
Tank B is empty and Tank A is 1/3 filled. Water flows in from a tap at a constant rate of 1.2 litres per minute.How long will it take for both tanks to be of the same height?
Refer to http://thinkingmath.com.sg/forum/35-thinkingmathonsponge/5790-how-did-you-do-psle-math-2010.html?limit=10&start=10.

Ans: 15 min

Hmm.....I got 3/4 for MCQ question 24 and I think that it is [list ALL the common factors of 12 and 8. But correct me if I'm wrong...

[snowman.022851697]

Isn’t 11 78?

[blessedami]

Since Box A has the most marbles, make the number of marbles in each box the same by


320+19+13+8=360

360/4=90 ( Number of marbles in A)

Since D has the least, the difference between D and A must be the greatest

So, the difference is 19.

90- 19= 71

[blessedami]

Hi desichan352,


What is Qusetion 24 ? Question 24 is not MCQ.

[snowman.022851697]

blessedami:

Since Box A has the most marbles, make the number of marbles in each box the same by


320+19+13+8=360

360/4=90 ( Number of marbles in A)

Since D has the least, the difference between D and A must be the greatest

So, the difference is 19.

90- 19= 71

Wowww now i is confused i forgot if i put 71 or 78...

wait...
320-19-13-6= 320- 32 - 6 = 282-6= 276
276/4 = 69
69?? wth??

[blessedami]

The addition way would have been easier


If u were to use your method,you would have to minus 19 and then only 6 for the 13 part and 11 for the 8 part.Bit confusing

In the end, it would be something like this:

320-19-6-11=284
284/4=71

[MMM]

skyjuice:

wonderm:

Super easy paper. DS had more than 1 hour for checking. Many of his classmates are confident of scoring full marks.

You must be joking! DS said PP2 very very tough! oh dear!

My nephew said he do paper 2 until nearly cannot finish and want to cry....

So those other comments... are they the smart kids? What is the realistic view of the paper difficulty?

[corneyAmber]

I am so amazed!! :faint:

[snowman.022851697]

That qn is 3-marks right?

[blessedami]

snowman.697:

That qn is 3-marks right?

Not really sure.
Since the marks allocation is different in PSLE and not in the order,I think it is only 3-mark.Even Question 6 was 4-mark