Q&A - P3 Math

[atutor2001]

1 method uses heuristic (in the past we remembered this approach as "making it equal and then working in pairs) while the other is pure mathematical approach.

I would pick the latter for the sake of future development to tackle complex problem.

[ET-PH]

atutor2001:

1 method uses heuristic (in the past we remembered this approach as \"making it equal and then working in pairs) while the other is pure mathematical approach.

I would pick the latter for the sake of future development to tackle complex problem.

The latter method uses the algebra concept, ie. let U be the number of 50 cents coins, just wonder if this is acceptable in school.

[whywhy]

Thank u all. This is a p4 question. I. will show my boy and see which method he can understand better. what abt your kids ? Heuristic or algebra method? Let’s poll n see.

[atutor2001]

ET-PH:

The latter method uses the algebra concept, ie. let U be the number of 50 cents coins, just wonder if this is acceptable in school.

Most top schools accept such method. My kids used such method more than 10 years ago (it was actually taught by one of their teachers who later became a math teacher for GEP). Yes there were complaints from some teachers but I ignore them. However, it is important to train the kids to start the question with \"Let ..... be ..U\" so that they have a good base for sec math.

The important thing is that if they don't get use to such mathematical modelling approach, it will be a nightmare solving complex problem sum. Based on what I see, the current 5 mark problems usually involve 3 unknowns. To solve with model is really tedious. Kids with know how on algebra and simultaneous can tackle them easily.

[atutor2001]

whywhy:

Thank u all. This is a p4 question. I. will show my boy and see which method he can understand better. what abt your kids ? Heuristic or algebra method? Let's poll n see.

No need to poll. More than 80% will go for heuristic. There is a strong belief that by understanding the solution heuristically, the children will go on to develop skills to tackle problem sum better. Unfortunately it is not very true. Otherwise mathematical method would not have been invented.

Cheers

[smartmummy]

Hi All!

I have a Qn.
A piece of ropeis 5m long.It is cut into two pieces.The first piece is longer by 20cm.What is the length of the second piece?
I did using model the answer was 260.
I did use Guess and check method answer was 270.
Are that my two answers correct?

For problem sums we need to draw models and number equations then sentence???

[aps]

Hi


There is a similar question which was discussed at this thread - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=27&t=6373&hilit=overall+average+will+be+85&start=3630

cheers.[/quote]

[MathIzzzFun]

smartmummy:

Hi All!

I have a Qn.
A piece of ropeis 5m long.It is cut into two pieces.The first piece is longer by 20cm.What is the length of the second piece?
I did using model the answer was 260.
I did use Guess and check method answer was 270.
Are that my two answers correct?

For problem sums we need to draw models and number equations then sentence???

Hi

Shorter piece = (500-20)/2 = 240cm
longer piece = 260cm, shorter = 240cm.

cheers.

[jedamum]

smartmummy:

Hi All!

I have a Qn.
A piece of ropeis 5m long.It is cut into two pieces.The first piece is longer by 20cm.What is the length of the second piece?
I did using model the answer was 260.
I did use Guess and check method answer was 270.
Are that my two answers correct?

For problem sums we need to draw models and number equations then sentence???

rope A is 260cm
rope B is 240cm
Difference is 20cm
Total is 500cm

second piece is 240cm.
whether to draw models for problem sums have to read instructions.
for my kid, he said that teacher said no need unless stated, but they can also draw, but if wrong, dunno will deduct marks anot.

[smartmummy]

jedamum:

smartmummy:

Hi All!

I have a Qn.
A piece of ropeis 5m long.It is cut into two pieces.The first piece is longer by 20cm.What is the length of the second piece?
I did using model the answer was 260.
I did use Guess and check method answer was 270.
Are that my two answers correct?

For problem sums we need to draw models and number equations then sentence???

rope A is 260cm
rope B is 240cm
Difference is 20cm
Total is 500cm

second piece is 240cm.
whether to draw models for problem sums have to read instructions.
for my kid, he said that teacher said no need unless stated, but they can also draw, but if wrong, dunno will deduct marks anot.

yah I the second piece is 240cm.
I realised that guess and check method answer is wrong/270 -230=40
Thank you jedamum!