
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  ProblemSolving Processes in Mathematics by Fabian Ng?
This book is great in giving examples for all the problem sums. But unfortunately, it doesnt come with fullyworked 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?
The answer: 1/8
I still dont know how they get 1/8.
Thanks in advance!

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
4/43/4=1/4
1/4 divide 2 = 1/8
Therefore, the answer is 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



