P4 Math - Internal Transfer

Academic support for Primary 4
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kiasuchabo
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P4 Math - Internal Transfer

Post by kiasuchabo » Tue Jun 30, 2020 7:35 pm

Hi , anyone here know how to solve this problem sum? The answer is 38. Thanks.
:rahrah:


Q.
Susan had 26 more sweets than Lina. Susan gave 48 sweets to LIna and got back 18 sweets back from Lina. Lina then had twice as many sweets as Susan. How many sweets did Lina have at first?
Draw a model and show the transfer.

zac's mum
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Re: P4 Math - Internal Transfer

Post by zac's mum » Tue Jun 30, 2020 10:43 pm

kiasuchabo wrote:
Tue Jun 30, 2020 7:35 pm
Hi , anyone here know how to solve this problem sum? The answer is 38. Thanks.
:rahrah:


Q.
Susan had 26 more sweets than Lina. Susan gave 48 sweets to LIna and got back 18 sweets back from Lina. Lina then had twice as many sweets as Susan. How many sweets did Lina have at first?
Draw a model and show the transfer.
My solution below. May I know which school’s paper is this?
Image

kiasuchabo
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Re: P4 Math - Internal Transfer

Post by kiasuchabo » Wed Jul 01, 2020 8:35 pm

Hi Zac's mum! Thanks very much! Got this from another parent , the question is from Xing Hua past year paper .:)

kiasuchabo
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Re: P4 Math - Internal Transfer

Post by kiasuchabo » Wed Jul 01, 2020 8:35 pm

Hi Zac's mum! Thanks very much! Got this from another parent , the question is from Xing Hua past year paper .:)

kiasuchabo
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Re: P4 Math - Internal Transfer

Post by kiasuchabo » Wed Jul 01, 2020 8:39 pm

Zac's mum, is there a technique or tips in solving this type of problem? Its so confusing .... to us hahaP


zac's mum
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Re: P4 Math - Internal Transfer

Post by zac's mum » Wed Jul 01, 2020 9:02 pm

The model I drew is based on the P4 Onsponge guide book which I bought. I don’t really recommend the book (even though many parents rave about it) - I don’t think it provides very clear guidance.

If this is the correct technique, then it seems the model makes use of “cutting up” the model to show that the transferred amount actually contains smaller numbers that you can manipulate to calculate the answer.

I’m not certain this is the correct technique though. Gotta wait for my son’s school teacher to teach them. So far not yet. Why Xinghua so advanced :nailbite:

zac's mum
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Re: P4 Math - Internal Transfer

Post by zac's mum » Wed Jul 01, 2020 9:06 pm

This is from page 33 of the Onsponge book:

Image

lovinglife
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Re: P4 Math - Internal Transfer

Post by lovinglife » Thu Jul 02, 2020 12:06 pm

P4 can use parts & units already right?

zac's mum
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Re: P4 Math - Internal Transfer

Post by zac's mum » Thu Jul 02, 2020 12:23 pm

lovinglife wrote:
Thu Jul 02, 2020 12:06 pm
P4 can use parts & units already right?
Already using units. What is “parts”?

John Lim
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Re: P4 Math - Internal Transfer

Post by John Lim » Thu Jul 02, 2020 1:01 pm

zac's mum wrote:
Thu Jul 02, 2020 12:23 pm
lovinglife wrote:
Thu Jul 02, 2020 12:06 pm
P4 can use parts & units already right?
Already using units. What is “parts”?
units -> x -> Ah Seng -> Romeo
parts -> y -> Ah Beng -> Juliet

actually,

parts & units -> Simultaneous equations :rotflmao:

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