Q&A - P4 Math

[24hr-mum]

i guess wf experts in ksp i can avoid math tuitn for my gal.

[kiasuMay11]

24hr-mum:

i guess wf experts in ksp i can avoid math tuitn for my gal.

Well said. Very true.

[HAPPYH]

24hr-mum:

i guess wf experts in ksp i can avoid math tuitn for my gal.

Agree agree agree. Tuition centres does not really cater to our needs. They come up with standard or challenging question papers and mostly following them without giving more importance to whether the kids understand. Sigh.

[mrskoo123]

Hi need help on following qns:


Alvin paid $26 for 4 books and 3 pens.
John paid $1 less than Alvin for 3 books and 5 pens.
What was the total cost for 1 book and 1 pen?

thanks in advance

[PiggyLalala]

mrskoo123:

Hi need help on following qns:


Alvin paid $26 for 4 books and 3 pens.
John paid $1 less than Alvin for 3 books and 5 pens.
What was the total cost for 1 book and 1 pen?

thanks in advance

4 books and 3 pens - 26
3 books and 5 pens + $1 - 26
Therefore the price of 1 book is equivalent to 2 pens + $1
4 books is equivalent to 8 pens + $4
Therefore 11 pens -$26 -$4 =$22
1 pen - $2 and 1 book - $5
1 pen and 1 book cost $7

[kiasuMay11]

PiggyLalala:

mrskoo123:

Hi need help on following qns:


Alvin paid $26 for 4 books and 3 pens.
John paid $1 less than Alvin for 3 books and 5 pens.
What was the total cost for 1 book and 1 pen?

thanks in advance

4 books and 3 pens - 26
3 books and 5 pens + $1 - 26
Therefore the price of 1 book is equivalent to 2 pens + $1
4 books is equivalent to 8 pens + $4
Therefore 11 pens -$26 -$4 =$22
1 pen - $2 and 1 book - $5
1 pen and 1 book cost $7

I understand. But how to explain to a P4?

[24hr-mum]

why is it +$1 and not -$1? i thot john paid $1 less?

[PiggyLalala]

Because the value of 3 books and 5 pens = $25

the value of 4 books and 3 pens = $ 26.
That is, if you buy one less book, you can get 2 more pens and $1, hence,
the value of 1 book = 2 pens + $1

[MathIzzzFun]

mrskoo123:

Hi need help on following qns:


Alvin paid $26 for 4 books and 3 pens.
John paid $1 less than Alvin for 3 books and 5 pens.
What was the total cost for 1 book and 1 pen?

thanks in advance

Hi

grouping concept in pictorial...

http://i45.tinypic.com/fnwxub.png\">

cheers.

[24hr-mum]

MathIzzzFun, that’s a great way. How did u get the idea of duplicating the 4book+3pen equation?