Q&A - P3 Math

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fashionbeautyinstyle:

Zann:

[quote=\"Vanilla Cake\"]Hi All,

I need your time & help to solve this P4 Maths qn from CHIJ CA1 2008 Q36.

Complete the number pattern : 1, 2, 4, P, 48, 240, Q.
Given answer : P is 26 and Q is 280.
Why ? :?

Thanks a lot!

The answer might be wrong. It seems more reasonable to be P = 12 and Q = 1440

I agreed that the answer might be wrong as there is no logic to it. The logical explanation is that the number is mulitply by the 1,2,3,4,5 sequence accordingly so I agreed with Zann on the answer.[/quote]Sorry fashionbeautyinstyle, even Zann's answer was more logical but I wonder how 1 * 1 will be equal to 2?

[mrs chua]

ngbrdad:

[Moderator's note: Topics merged.]


This is the question in my son's math worksheet :

Mrs Chan has some sweets to be given to her pupils.
If she gives each pupil 5 sweets, she will have 61 sweets left.
If she gives each pupil 8 sweets, she will need 2 more sweets.
How many pupils does Mrs Chan have ?

I used algebra and get the answer as 21

Is there any other solution ?

The solution provided seems to be using stacking diagram and the working of (61+2) / 3 which to me looks like algebra equation .

Is algebra equation acceptable in P4 math ?

For this question, My son sch uses the guess and check approach.

[lizawa]

[quote]
ngbrdad wrote:
[Moderator's note: Topics merged.]

This is the question in my son's math worksheet :

Mrs Chan has some sweets to be given to her pupils.
If she gives each pupil 5 sweets, she will have 61 sweets left.
If she gives each pupil 8 sweets, she will need 2 more sweets.
How many pupils does Mrs Chan have ?

I used algebra and get the answer as 21

Is there any other solution ?

The solution provided seems to be using stacking diagram and the working of (61+2) / 3 which to me looks like algebra equation .

Is algebra equation acceptable in P4 math ?


For this question, My son sch uses the guess and check approach.
[/quote]Hi,

You can use model for this.

The key is : 8 = 5 + 3

See solution here :
http://www.flickr.com/photos/9607398@N02/3325931750/sizes/o/

[siti]

Anyone can help? I have one question. Wonder how to explain to my girl.


A + B = 200
A - B = 76

What is A and what is B?

[lizawa]

siti:

Anyone can help? I have one question. Wonder how to explain to my girl.


A + B = 200
A - B = 76

What is A and what is B?

If your daughter can accept solving the 2 equations by adding the right hand side together and equate to the left hand side, then you can do so. After adding : 2A = 276. And you solve for A and B.

If not, use the model.

A+B = 200
______________
|___A___|__B__|

A-B = 76, means one part is 76, the other part is B, the whole figure is A
_________
|_76|_B__|

Then break up the 1st model 'A' into the same \"76\" and \"B\"
you get

76 + B + B = 200

Then solve for B, then solve for A.

[tianzhu]

Hi

Hope this helps.

http://farm4.static.flickr.com/3414/3338039616_a7a248a939_o.jpg\">

[siti]

lizawa:

siti:

Anyone can help? I have one question. Wonder how to explain to my girl.


A + B = 200
A - B = 76

What is A and what is B?

If your daughter can accept solving the 2 equations by adding the right hand side together and equate to the left hand side, then you can do so. After adding : 2A = 276. And you solve for A and B.

If not, use the model.

A+B = 200
______________
|___A___|__B__|

A-B = 76, means one part is 76, the other part is B, the whole figure is A
_________
|_76|_B__|

Then break up the 1st model 'A' into the same \"76\" and \"B\"
you get

76 + B + B = 200

Then solve for B, then solve for A.

Thanks thanks... I think this model is good. I explain to my girl and she understand. But I teach her to write this way

2 units of B -> 200 - 76 = 124
1 unit of B -> 124/2 = 72

A -> 200 - 72 = 128

Thank you. :celebrate:

[Vanilla Cake]

Hi,


Thks for your time and solution for this P4 Maths 5-mark Qn from SCGS SA1 2008 Q42. Pls use model drawings as far as possible & applicable for P4 level :

Library A keeps 50 books more than Library B. If 120 books are transferred to Library B from Library A, there will be twice as many books in Library B as in Library A. How many books are there altogether ?

:salute:

[tianzhu]

Hi,hope this helps.

http://farm4.static.flickr.com/3372/3431668212_9e7aa24b29_o.jpg\">

[Vanilla Cake]

Yes, it helps.

Thank you very much, tianzhu.

:thankyou: