Q&A - P3 Math

[Suz855]

Thanks Tang, appreciate your help .... I was using the Dr Fong Ho Kheong Maths guide and he was illustrating this kind of problem using the model approach ... then I realised that a typical qn will have both constrains as constant or same thus using model to illustrate the 2 differences will easily solve the problem .... however, this problem itself, only the mass of the bag of rice is constant, the packets varies (depending on the mass packed either 5kg or 7kg)thus probably it will be easier solve using the list strategy or the guess and check methology.



Suz

[Tang]

Suz855:

Thanks Tang, appreciate your help .... I was using the Dr Fong Ho Kheong Maths guide and he was illustrating this kind of problem using the model approach ... then I realised that a typical qn will have both constrains as constant or same thus using model to illustrate the 2 differences will easily solve the problem .... however, this problem itself, only the mass of the bag of rice is constant, the packets varies (depending on the mass packed either 5kg or 7kg)thus probably it will be easier solve using the list strategy or the guess and check methology.



Suz

There are many more examples of such questions solved using model drawings. For your reference.

http://p4mathsquestions.blogspot.com/

[Tranquility8706]

Kindly help with these qns


1) Wendy had 55 more stickers than Susan.
After Wendy give away 155 of her stickers to Yvonne
Susan had 3 times as many stickers as Wendy
How many stickers did Susan have?


2) There are 400 pupils in Primary Three.
288 pupils like Mathermatics and 182 pupils like Science.
All pupils like at least Mathermatics or Science.
How many pupils like both Mathermatics and Science?

Thank you

[john.09525316]

Tranquility8706:

Kindly help with these qns


1) Wendy had 55 more stickers than Susan.
After Wendy give away 155 of her stickers to Yvonne
Susan had 3 times as many stickers as Wendy
How many stickers did Susan have?


2) There are 400 pupils in Primary Three.
288 pupils like Mathermatics and 182 pupils like Science.
All pupils like at least Mathermatics or Science.
How many pupils like both Mathermatics and Science?

Thank you

QN 1 answer is Susan has 150 stickers

QN 2 There are 142 pupils like Math and Science.

Am I getting the correct answer? Pls let me know. Thank u!

[James Ang]

Tranquility8706:

Kindly help with these qns


1) Wendy had 55 more stickers than Susan.
After Wendy give away 155 of her stickers to Yvonne
Susan had 3 times as many stickers as Wendy
How many stickers did Susan have?


2) There are 400 pupils in Primary Three.
288 pupils like Mathermatics and 182 pupils like Science.
All pupils like at least Mathermatics or Science.
How many pupils like both Mathermatics and Science?

Thank you

1.

155-55 = 100
3u-1u=2u =>100
3u=>150

Susan has 150 stickers

2.

288+182-400=70

70 pupils like both

[Tranquility8706]

john.316:

QN 1 answer is Susan has 150 stickers


QN 2 There are 142 pupils like Math and Science.

Am I getting the correct answer? Pls let me know. Thank u!

Hi John,

Thanks alot.
I am still waiting her teacher return the paper back to my dd.
Will let you know once I got it.

Thank you

[James Ang]

john.316:

QN 1 answer is Susan has 150 stickers


QN 2 There are 142 pupils like Math and Science.

Am I getting the correct answer? Pls let me know. Thank u!

how did you get 142?

[tianzhu]

Hi

Hope this helps

http://farm4.static.flickr.com/3552/3816681348_9e16311e67_o.jpg\">

http://farm4.static.flickr.com/3440/3816681432_40f93f0256_o.jpg\">

[Tranquility8706]

Thank you very much… Tianzhu

[john.09525316]

[quote]how did you get 142?[/quote]
Sorry I have made a silly and careless mistake.
It should be 70.