Q&A - P5 Math

[tianzhu]

Hi


Hope this helps.

Best wishes.

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[tianzhu]

Hi


For P2 Q17

Part (a) is a gift, the answer is 140cm.

For part (b)

A:B ------- 80:140 -------4:7
Common multiple ------- 28

So you can get 7 pieces of A and 4 pieces of B.

A means plank in figure A (80) and B means plank in figure B (140)

Consider 1 set of A and B

Number of circular stickers ----- 74 -----28

Number of triangular stickers ------ 49 ------36

Total number of stickers ------64

There are (36-28) or 8 more triangular stickers than circular stickers in one set.

136/8 ----- 17

17*64 ------1088.

If you need the slides, please let me know.

Best wishes.

[PiggyLalala]

tianzhu:

Hi


Hope this helps.

Best wishes.

http://farm7.static.flickr.com/6205/6122997729_9ce9c915f3_z.jpg\">

:thankyou: for the solution.
Q28 is really a tough one. I was about to use similar triangles ( which is not in the primary school syllabus) to find the area.

Questions on area can be quite tough. Any techniques/advice/steps for the pupils to think through when solving challenging area questions? Thanks

[tianzhu]

Hi pixiedust


P2 Q12(a) ----- Your answer is correct.

Best wishes

[tianzhu]

PiggyLalala:

:thankyou: for the solution.
Q28 is really a tough one. I was about to use similar triangles ( which is not in the primary school syllabus) to find the area.

Questions on area can be quite tough. Any techniques/advice/steps for the pupils to think through when solving challenging area questions? Thanks

Hi

First, you must have faith in the KS philosophy.

Keep in Syllabus.
Keep it Simple
Keep it Short.

Rearrange the areas into familiar looking shapes; look nothing more than what your teacher taught you in school.

Best wishes

[PiggyLalala]

tianzhu:

PiggyLalala:

:thankyou: for the solution.
Q28 is really a tough one. I was about to use similar triangles ( which is not in the primary school syllabus) to find the area.

Questions on area can be quite tough. Any techniques/advice/steps for the pupils to think through when solving challenging area questions? Thanks

Hi

First, you must have faith in the KS philosophy.

Keep in Syllabus.
Keep it Simple
Keep it Short.

Rearrange the areas into familiar looking shapes; look nothing more than what your teacher taught you in school.

Best wishes

Thank you for your advice again.
I have no wish to coach my child additional concept too as I strongly believe that all the questions tested in the primary school exam and PSLE can be done solely based on the primary school syllabus.

Got your hints. Keep the solution simple and short. Do not teach extra.
and most importantly try to rearrange the areas into familiar looking shapes; look nothing more than what your teacher taught you in school.

:thankyou:

[tianzhu]

PiggyLalala:

:thankyou:

Hi

You're welcome.

Best wishes

[pixiedust]

Thank you, tianzhu ! I looked at q28 all day then I told me ds I have to ask my internet friends !


I really 心服口服 with your elegant solutions! Q17, yes I can digest, no need slides. Thanks again!

[tianzhu]

pixiedust:

Thank you, tianzhu ! I looked at q28 all day then I told me ds I have to ask my internet friends !


I really 心服口服 with your elegant solutions! Q17, yes I can digest, no need slides. Thanks again!

Hi

You're welcome.

For Q17, I've reduced 80:140 to the lowest equivalent ratios of 4:7 to make the calculations easier.Please refer to the revised solution in earlier post.The rest remains the same.

Best wishes

[bbkoala]

Hi


I have a Maths question that has been bothering me for weeks!
Hope someone can enlighten me…

100 workers were paid a total of $24750. If 25% of them received 20% more money than the remaining men, calculate the amount received by each man from the group who got less.

Ans is $150.

I can’t get this value, and tried working backwards using $150, but couldn’t get $24750.

Many thanks!