Q&A - P3 Math

[Muffins]

24hr-mum:

i thought 'as many local stamps' means u r using the local stamps as the base for comparison, so the local is 1x and the foreign is 5x?? i m a bit confused..

Hi 24 hour mum, although it may look that way, it actually isn't.

Take an example - If A had 5 $1 coins, and B had 1 $1 coin, then A would have 5 times as many $1 coins as B.

Hope that helped

[24hr-mum]

another question:

John has 24 sweets more than Mary.
How many sweets must John give Mary so that Mary will have 12 sweets more than John?

how to draw the model?

[Sun_2010]

24hr-mum:

another question:

John has 24 sweets more than Mary.
How many sweets must John give Mary so that Mary will have 12 sweets more than John?

how to draw the model?

The excess that John has should be divided equally between him and Mary.

So john must give 24/2 = 12 sweets to mary.

http://i54.tinypic.com/11u94sg.jpg\">

My bad, More careless than my Children

sorry 24 hr mum, will redo model

[Sun_2010]

http://i54.tinypic.com/29kumpw.jpg\">

WCW:

Sun_2010:

[quote=\"24hr-mum\"]another question:

John has 24 sweets more than Mary.
How many sweets must John give Mary so that Mary will have 12 sweets more than John?

how to draw the model?

The excess that John has should be divided equally between him and Mary.

So john must give 24/2 = 12 sweets to mary.

http://i54.tinypic.com/11u94sg.jpg\">

Sun, this will make them to have same amount of sweets :)[/quote]
Yeah, sorry more careless than my kids :slapshead:

Here is the revised model

http://i54.tinypic.com/29kumpw.jpg\">

John should first give 12 sweets to Mary, then divide the excess equally.

So 24 - 12= 12
12 /2 = 6

so john should give 12+6 = 18

[24hr-mum]

oh that’s a gd way to understand the question. give away the 12 first. thanks!

[24hr-mum]

but its hard to tell from the abv model that the amt to be given in 18 cos the first part is the 12…

[chloecube]

anyone can help?


John made 437 paper cranes and Robert made 124 more. How many paper cranes must Robert give to John so that Robert had 36 more cranes than John?

[PiggyLalala]

chloecube:

anyone can help?


John made 437 paper cranes and Robert made 124 more. How many paper cranes must Robert give to John so that Robert had 36 more cranes than John?

this question is similar to the question posted by 24hr-mum.

Solution:
124 - 36 = 88
88 / 2 = 44
Therefore robert must give 44 cranes to john.

[chloecube]

PiggyLalala:

chloecube:

anyone can help?


John made 437 paper cranes and Robert made 124 more. How many paper cranes must Robert give to John so that Robert had 36 more cranes than John?

this question is similar to the question posted by 24hr-mum.

Solution:
124 - 36 = 88
88 / 2 = 44
Therefore robert must give 44 cranes to john.

thks piggylalala
yes, ans is 44
but i dun quite understand :scratchhead: why the solution is such, maybe i go and study the earlier model and see if i can understand ..

[24hr-mum]

i still dun quite understand how to draw or interpret the model, but logically, for chloecube’s question, u can see it as such:

robert already has 124 more than john.
now, how to make that difference between them lesser? robert must give some more to john so that he has only 36 more (instead of 124 more) than John. so of cos robert must give some more.
next step, fixed the (new) difference between them to be 36. so any difference ie 124-36=88 will have to be shared between the two equally or else the difference wont be 36.
but how to make the child understand logically is a headache