Q&A - PSLE Math

[Brenda10]

Vanilla Cake:

Dear Brenda10,


From the question, it's stated that the total perimeter of the shaded parts is 8 m so why should we rearrange the 2 shaded rectangles to form a figure that have 3 shaded rectangles side by side?

I think that it's good idea to post the complete question with the diagram for other KSP members to see and provide their feedbacks. Could you pls help to post this question?

Thanks

PS: I don't know how to resize the diagram so I can't help much. If not, just wait for the online version for this paper to be available so that we can provide the link for this question.

Thks.

Dear VC

I still think your sister answer is right as the 3 shaded parts are not next to each other.

I also can't resize the diagram. Let's KIV this question.

BTW, we are happy to learn from you in all these questions.

Thank you.

[Vanilla Cake]

Brenda10:

Dear VC


I still think your sister answer is right as the 3 shaded parts are not next to each other.

I also can't resize the diagram. Let's KIV this question.

BTW, we are happy to learn from you in all these questions.

Thank you.

Dear Brenda10,

I have PM for you. From the 5 sets of 2010 P6 CA1 Maths papers that my younger sister had done so far, it's still manageable as only 2 new topics are added - net and algebra. With 2 more topics - circles and speed to be added, the SA1 papers will not be easy compared to the CA1 papers.

According to http://www.orlesson.org/orp/, the 2010 exam papers will be available from Jan 2011. Let's KIV this question for the time being and I will post it again to seek help from other KSP members.

I am too happy to learn from you and DD too,助人为快乐之本.


PS: I have posted 2 English questions from http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=308264#308264 in PSLE English thread.Real headache.

[Brenda10]

Vanilla Cake:

Dear Brenda10,


I have PM for you. From the 5 sets of 2010 P6 CA1 Maths papers that my younger sister had done so far, it's still manageable as only 2 new topics are added - net and algebra. With 2 more topics - circles and speed to be added, the SA1 papers will not be easy compared to the CA1 papers.

According to http://www.orlesson.org/orp/, the 2010 exam papers will be available from Jan 2011. Let's KIV this question for the time being and I will post it again to seek help from other KSP members.

I am too happy to learn from you and DD too,助人为快乐之本.


PS: I have posted 2 English questions from http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=308264#308264 in PSLE English thread.Real headache.

Dear VC

Thank you for your PM.


I agree with you that so far the CA1 Papers that dd did are still manageable. I also have concern with circle and speed as noted so many speed questions being raised few months before PSLE 2010.

As for the English questions you mentioned in the other forum, our answer also slightly different from the answer key.

We are also happy to have both of you 志同道合 and also others 高手great support in our learning journey. :lol:

Cheers

[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.

[atutor2001]

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

[Vanilla Cake]

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

[Brenda10]

Vanilla Cake:

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

Dear VC

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

[Muffins]

Vanilla Cake:

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

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....


________________________________________________________

Status report: Millions of tiny itchy things on my hands, not sure what it is...

[Vanilla Cake]

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

Dear Brenda10,
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.

No problem as P6 CA1 Maths exam are not as significant as P6 SA1/Prelim Maths exam for most people.
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.

[Vanilla Cake]

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.