Q&A - P3 Math

[tianzhu]

jolenekoh:

Alan, Benny and Calvin have 120 stamps altogether. Alan has 5 stamps more than Benny. Benny has twice as many stamps as Calvin.
How many stamps does Calvin have/

Hi

Just curious

MCQ or OE?

Draw one box to show Calvin.

Draw two boxes to show Benny.

Draw two boxes + 5 to show Alan.

5 boxes + 5 ----- 120

5 boxes ----- 115

1 box ----- 23

Calvin ----- 23 stamps

Best wishes

[jolenekoh]

Hi Tianzhu, It is a MCQ , problem is i know how to do the working but the explanation abit confuse to him. Now with the method you show, it will be easier for me


Thank you

tianzhu:

jolenekoh:

Alan, Benny and Calvin have 120 stamps altogether. Alan has 5 stamps more than Benny. Benny has twice as many stamps as Calvin.
How many stamps does Calvin have/

Hi

Just curious

MCQ or OE?

Draw one box to show Calvin.

Draw two boxes to show Benny.

Draw two boxes + 5 to show Alan.

5 boxes + 5 ----- 120

5 boxes ----- 115

1 box ----- 23

Calvin ----- 23 stamps

Best wishes

[bboomer71]

tianzhu:

jolenekoh:

May I know how to explain to kid?


Mrs Chua bakes some tarts to distribute to her neighbours
When she gives each of them 4 tarts, she will have 6 extra tarts.
When she gives each of them 6 tarts, she will need to bake another 4 tarts more. How many neighbours does she have?

Hi

The common method used in P3 maths is Systematic Listing (SL).

Please use this slide (P5 question) as an example), the approach is the same.

A quicker way is to use the concept of “Excess and Shortage” .

In the first scenario, the excess is 6 tarts.

In the second scenario, there is a shortage of 4 tarts.

In order to give each of her neighbours two more tarts, Mrs. Chua needs to bake 10(6+4)) more tarts.

Difference in number of tarts given to each neighbor ------ 6 - 4 ------ 2

Number of neighbours ------- (6+4)/2 ------- 5

Best wishes

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Hello, another way of understanding this sum is as follows pls.

2 extra erasers --> 53-5 = Need 48 more erasers.
1 extra eraser --> 48/2 = Need 24 more
(a) 24 more = 24 students in the class (Each student gets 1 more.)
(b) At first --> (24*7)+53 = 221 erasers

I am a parent of a P3 kid and am tutoring him myself. This thread has been a great help. Heartfelt thanks to all the experts indeed, esp. tianzhu's models and explanation!

[mother777]

Hi All,


Pls help to advise about the best method to solve the below type of questions (any model we can teach to children):
1) The product of 2 facing page numbers is 132. What are the 2 page numbers?
2) Mrs Choy bought 20 forks and spoons for $48. Each fork cost $2. Each spoon cost $3, how many forks did she buy?

Questions from Aitong P3 2012 SA1 paper

[mother777]

Thank you

[ericleets]

Ken, Don, Mark and John are to share 224 marbles among themselves. Mark receives 5 marbles more than each of the other boys. How many marbles does each other boys receive? ( Draw a model to help you solve the problem)


Thanks in advance and a great weekend!

[PapayaDad]

seems like the numbers is incorrect


ken=u
don=u
john=u
mark=u+5

Draw:
<u>
<u>
<u>
<u>+5

Total = 4u + 5 = 224
4u=219…

[happyheart]

Can I know how to solve this question?


Adeline has 1450 coins. Tracy had 2740 coins. After Tracy had given some coins to Adeline, they had the same number of coins each. How many coins did each of them have at the end?
Thanks in advance.

[happyheart]

This question, logically can be solved by making the denominator the same but DS has not been taught so. How may I best approach to teach him? Pls help.


Q) John read 2/9 of a book on Monday. He then read 1/3 of the book on Tuesday. He then completed reading the rest of the book on Wednesday. What fraction of the book did he read on Wednesday?

This question is from Rosyth SA1 2012 , Q40. This paper consists of 3-4 similar fraction questions. Thanks.

[Oldschool]

happyheart:

Can I know how to solve this question?


Adeline has 1450 coins. Tracy had 2740 coins. After Tracy had given some coins to Adeline, they had the same number of coins each. How many coins did each of them have at the end?
Thanks in advance.

Hi,

http://i39.tinypic.com/1t0fmw.jpg\">

Regards