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 Forum Index >  Test Paper Related >  Primary 3 Matters Maths Problem Solving from Fabian Ng
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 By: pearldyn (offline)  Saturday, October 24 2009 @ 10:15 AM CDT (Read 6291 times)
pearldyn

Hi,

I wonder if any of you ever buy an assessment book by EPH - Problem-Solving Processes in Mathematics by Fabian Ng?

This book is great in giving examples for all the problem sums. But unfortunately, it doesnt come with fully-worked solutions for the answers. Therefore, I am having this problem that I couldnt solve.

PSP 78, Pg 308

Question:
July was given 1/2 of a piece of chocolate.
Doris was given 1/2 of the remaining chocolate.
The rest of the chocolate was shared equally between 2 boys.
What fraction of the original chocolate did each of the boys receive?

I still dont know how they get 1/8.

Junior

Registered: 06/17/09
Posts: 30

 By: yongjianrong (offline)  Sunday, October 25 2009 @ 01:50 AM CDT
yongjianrong

Oh, here are the steps:

1 - 1/2 = 1/2
1/2x1/2 = 1/4
1/2+1/4 = 2/4+1/4 = 3/4
4/4-3/4=1/4
1/4 divide 2 = 1/8

Let me guess, you're P3/P4?

Newbie

Registered: 12/31/06
Posts: 4

 By: pearldyn (offline)  Monday, October 26 2009 @ 09:49 AM CDT
pearldyn

Thank you! By the way my son is in P3.

Junior

Registered: 06/17/09
Posts: 30

 By: rathanackumr (offline)  Monday, September 06 2010 @ 01:30 AM CDT
rathanackumr

Demonstrating with model. Cheers

Junior

Registered: 07/22/10
Posts: 18

 By: tanhuimin (offline)  Monday, September 06 2010 @ 02:26 AM CDT
tanhuimin

P3 is expected to solve this question by model drawing.

1. draw a long rectangle, cut into half, 1st half for July
2. cut the 2nd half into 2 equal part again, and keep the 1st half for Doris -- see model
3. cut the last part into half again for the 2 boys
4. look at the model, the smallest unit is 1/8 of the original 1 whole, so answer is 1/8

Junior

Registered: 12/31/06
Posts: 18

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