Q&A - PSLE Math
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Musicstar:
Instead of multiplying a certain number , A, by 50, Dick multiplied it by 15. The answer was 1575 less than the correct answer. Find the correct value of A x 5 +5.
Imagine the number A as 1unit in a model.
50 x A will be 50 units.
15 x A will be 15 units
The difference = 50 - 15 = 35 units
35 units = 1575
1 unit = 45 (which is the number A)
A x 5 + 5 = 45 x 5 + 5 = 230 -
Hi,
Thks for your time and response in order to help my younger sister in her preparation for 2011 PSLE exam. Her answers for these questions do not tally with the answers given. Pls kindly help her to aid her understanding.
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 1 Q2 [1 mark]:
A papaya is 2½ times as heavy as an apple.
What is the ratio of the mass of the apple to the mass of the papaya?
(1) 1 : 4
(2) 2 : 5
(3) 4 : 1
(4) 5 : 2
Answer given : Option 4
Her answer : Option 2
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 2 Q5 [2 marks]:
297 digits are used to print the page numbers of a story book.
What is the number on the last page number of the story book?
Answer given : 165
Her answer : 135
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 2 Q18 [5 marks]:
7 apples cost $4
9 oranges cost $11
James boughta total of 1000 apples and oranges for $999.
How many apples and how many oranges did he buy?
Answer given : 657 apples and 343 oranges
Her answer : 657 oranges and 343 apples -
Vanilla Cake:
Dear VCHi,
Thks for your time and response in order to help my younger sister in her preparation for 2011 PSLE exam. Her answers for these questions do not tally with the answers given. Pls kindly help her to aid her understanding.
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 1 Q2 [1 mark]:
A papaya is 2½ times as heavy as an apple.
What is the ratio of the mass of the apple to the mass of the papaya?
(1) 1 : 4
(2) 2 : 5
(3) 4 : 1
(4) 5 : 2
Answer given : Option 4
Her answer : Option 2
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 2 Q5 [2 marks]:
297 digits are used to print the page numbers of a story book.
What is the number on the last page number of the story book?
Answer given : 165
Her answer : 135
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 2 Q18 [5 marks]:
7 apples cost $4
9 oranges cost $11
James boughta total of 1000 apples and oranges for $999.
How many apples and how many oranges did he buy?
Answer given : 657 apples and 343 oranges
Her answer : 657 oranges and 343 apples
These 3 question, DD answer same with your sister.
For Q5 in this paper, her working is as follow:
1 to 9 --- 9
10 to 99 --- 90 x 2 = 180
297-189 = 108
108/3= 36
Therefore 9+90+36= 135
We have doubt at that time but did not seek for clarification and thank you that you have highlighted.
Best Regards -
Vanilla Cake:
Hi VC, when tried to solve, my answers were same as your DD. Sometimes, the answers, especially from topschools practice papers, can't be trusted....Hi,
Thks for your time and response in order to help my younger sister in her preparation for 2011 PSLE exam. Her answers for these questions do not tally with the answers given. Pls kindly help her to aid her understanding.
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 1 Q2 [1 mark]:
A papaya is 2½ times as heavy as an apple.
What is the ratio of the mass of the apple to the mass of the papaya?
(1) 1 : 4
(2) 2 : 5
(3) 4 : 1
(4) 5 : 2
Answer given : Option 4
Her answer : Option 2
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 2 Q5 [2 marks]:
297 digits are used to print the page numbers of a story book.
What is the number on the last page number of the story book?
Answer given : 165
Her answer : 135
Pei Hwa Presbyterian Primary School 2010 P6 CA1 Maths
Paper 2 Q18 [5 marks]:
7 apples cost $4
9 oranges cost $11
James boughta total of 1000 apples and oranges for $999.
How many apples and how many oranges did he buy?
Answer given : 657 apples and 343 oranges
Her answer : 657 oranges and 343 apples
________________________________________________________
Status report: Millions of tiny itchy things on my hands, not sure what it is...
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Brenda10:
Dear Brenda10,For Q5 in this paper, her working is as follow:
1 to 9 --- 9
10 to 99 --- 90 x 2 = 180
297-189 = 108
108/3= 36
Therefore 9+90+36= 135
My P5 sister's working:
1 to 9-> 9 digits
10 to 99 -> 180 digits
100 to 135 -> 108 digits
The number is 135.Brenda10:
No problem as P6 CA1 Maths exam are not as significant as P6 SA1/Prelim Maths exam for most people.We have doubt at that time but did not seek for clarification and thank you that you have highlighted.
Has DD started doing 2010 P6 SA1 Maths exam papers? This morning, I browsed through the 14 sets of 2010 P6 SA1 Maths exam papers and noted that some questions are not so easy.
Thks. -
Muffins:
Sometimes, the answers, especially from topschools practice papers, can't be trusted....
The answers are not the original answer keys from the respective schools and this explains why the answers given are not reliable.
Off topic, from your http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=7234&postdays=0&postorder=asc&start=250 dated 04 Dec 2010 13:50, could you start a new topic/thread to show how you post pictures in KSP forum when you have time? Right now, I don't know how to resize the pictures/diagrams when posting in KSP forum?
Thks. -
Vanilla Cake:
Dear VCDear Brenda10,
No problem as P6 CA1 Maths exam are not as significant as P6 SA1/Prelim Maths exam for most people.
My P5 sister's working:
1 to 9-> 9 digits
10 to 99 -> 180 digits
100 to 135 -> 108 digits
The number is 135.Brenda10:
We have doubt at that time but did not seek for clarification and thank you that you have highlighted.
Has DD started doing 2010 P6 SA1 Maths exam papers? This morning, I browsed through the 14 sets of 2010 P6 SA1 Maths exam papers and noted that some questions are not so easy.
Thks.
We have not yet started and all the SA1 Maths is still in the plastic bag.
If you find some question not easy that I can foreseen did will have problem.
Best Regards -
Brenda10:
Dear Brenda10,Dear VC
We have not yet started and all the SA1 Maths is still in the plastic bag.
If you find some question not easy that I can foreseen did will have problem.
Best Regards
Yes, better don't 掉以轻心 and must 步步为营. Anyway, will start to do 2010 P6 SA1 Maths exam paper, this week. Next year's (2011) PSLE written exam starts early compared to previous exam dates in order to finish before 2011 Children's day celebration.
Best regards. -
Vanilla Cake:
Dear VC
Dear Brenda10,Brenda10:
Dear VC
We have not yet started and all the SA1 Maths is still in the plastic bag.
If you find some question not easy that I can foreseen did will have problem.
Best Regards
Yes, better don't 掉以轻心 and must 步步为营. Anyway, will start to do 2010 P6 SA1 Maths exam paper, this week. Next year's (2011) PSLE written exam starts early compared to previous exam dates in order to finish before 2011 Children's day celebration.
Best regards.
Yes. Never 掉以轻心 especially in Maths. Ha Ha these two cheng yu are part of dd favourable cheng yu when answering the CL compreh.
We will start next week and hopefully can finish the Section C before end of the year.
Thank you -
Hi, Pls help
The ratio of the number of stickers Alex had to the number of stickers Beng Han had was 1:3. After each of them received 25 stikers, the ratio became 3:4. How many stickers did they have altogether at first?
TIA
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