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 Forum Index >  Test Paper Related >  Primary 5 Matters
 Ai Tong School 2011 SA1 Q8 & Q11
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By: geniuskids (offline)  Tuesday, May 01 2012 @ 08:28 AM CDT (Read 3005 times)  
geniuskids

I need help. Please help me solve the following and provide detailed solutions. Thanks!

Q8 Three children sold some funfair tickets. Alex sold 5/8 of the tickets. Bei Shan sold 36 tickets fewer than Alex. Chai Lian sold 20 tickets. How many did they sell altogether?



Q11. Some pupils from 5K, 5L and 5M took part in a Social Studies quiz. 34 participants were from 5L and 5M. 21 participants were not from 5L and 19 participants were not from 5M. How many pupils from these 3 classes took part in the quiz?

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By: echeewh (offline)  Tuesday, May 01 2012 @ 09:58 PM CDT  
echeewh

Hi there,

Following pls find the worked solutions :

Q8
A = 5u; B = 5u - 36; C = 20
Total sold = 8u

So we have ...

5u + ( 5u - 36 ) + 20 --> 8u
10u - 8u --> 36 - 20
2u --> 16
1u --> 8
Total sold = 8u --> 8 x 8 = 64

===================================

Q11.

L + M = 34 --- (1)
K + M = 21 --- (2)
K + L = 19 --- (3)

(1) + (2):
L + K + 2M = 55 --- (4)

Substitute (3) into (4):
19 + 2M = 55
2M = 55 - 19 = 36
M = 36 / 2 = 18

Substitute M into (2):
K + 18 = 21
K = 3

Substitute M into (1):
L + 18 = 34
L = 16

Total pupils = K + L + M = 3 + 16 + 18
= 37

============================================

Trust these help.

Cheers,
Edward

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By: geniuskids (offline)  Wednesday, May 02 2012 @ 12:14 PM CDT  
geniuskids

Thanks Edward for your help But for Q11, you provided the answers using Simultaneous. While I understand the concept, I am just wondering if I should teach my boy this at P5 as it is not within the school syllabus. I do understand that kids need to be exposed to challenging questions, but are there other methods like model drawing for eg. to solve such questions? How will the poor kid know if they are not even taught the foundation of Simulataneous Eq.

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By: echeewh (offline)  Wednesday, May 02 2012 @ 08:29 PM CDT  
echeewh

Hi, i believe you can illustrate the above by way of models as given in the eqns (1) , (2) and (3). It will definitely help your child to understand n visualise better. Actually methods similar to principles of simultaneous method were used in P3 , P4 onwards to solve problems. The name of the method isnt used and usually the approach is in the form of diagrams or pictures. Nowadays, there are several methods n concepts used to show children how to resolve heuristic and other non-routine problems and most of these do not use models anymore. Simultaneous method is one of these and you can find this method (plus others ) published in some 'good' reference books for primary maths.

All the best to your kids Smile

Cheers

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By: MathIzzzFun (offline)  Thursday, May 03 2012 @ 01:53 AM CDT  
MathIzzzFun

Quote by: geniuskids

Thanks Edward for your help But for Q11, you provided the answers using Simultaneous. While I understand the concept, I am just wondering if I should teach my boy this at P5 as it is not within the school syllabus. I do understand that kids need to be exposed to challenging questions, but are there other methods like model drawing for eg. to solve such questions? How will the poor kid know if they are not even taught the foundation of Simulataneous Eq.



Hi

this question can be solved using the "grouping concept" - http://tinyurl.com/mathizzzfun-Grouping-201205-01

cheers.

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By: antony17 (offline)  Friday, May 04 2012 @ 12:15 PM CDT  
antony17

Q 11

L + M = 34
K + M = 21
L + K = 19

2L + 2M + 2K = 34 + 21 +19
=74

L + M + K = 74 / 2
= 37

Hope this helps.

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By: geniuskids (offline)  Saturday, May 05 2012 @ 08:20 AM CDT  
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Hi Mathlzzfun,

I cant't open your link. Can repost again? Many Thanks

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By: MathIzzzFun (offline)  Saturday, May 05 2012 @ 10:42 AM CDT  
MathIzzzFun

Quote by: geniuskids

Hi Mathlzzfun,

I cant't open your link. Can repost again? Many Thanks



Hi

the link is still working.. highlight the url and open link or just copy and paste the url

cheers.

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By: geniuskids (offline)  Saturday, May 05 2012 @ 11:41 AM CDT  
geniuskids

So much thanks Mathlzzfun, i got it.

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