Q&A - PSLE Math

[Musicstar]

Hi,


Can someone help to explain the following questions? Although my girl is already P6 but I have been doing this type of questions but still do not understand when to "+" and "-". How do I look at the question to understand? Can someone enlighten me to better understanding? My girl has this question wrong. I think she also still not sure how to do it. Sorry, it may be an easy question for others. Thank you for helping to explain.

Questions: Vicky and her sister have a sum of money . If Vicky gives $120 to her sister, she will have 3 times as much money as her sister. If Vicky gives an additional $40 to her sister, she will have $240 more than her sister . How much money does her sister have?

Answer : 2u = 40 +240+40 = $320
1 u = 160
160 - 120 =40
Her sister has $40.

[Musicstar]

Hi,


Please help . How to get 3 units?


Question: Jack and Jill owned a chicken farm each. If Jack and Jill sold 60 chickens and 30 chickens respectively in a day, Jack would have 300 chickens left when Jill has sold all her chickens. If Jack sold 30 chickens a day and Jill sold 60 chickens a day, Jack would have 930 chickens left when Jill has sold all her chickens. Find the number of chickens Jack has on his farm.

Answer : 3 u = 930 - 300 = 630
1u = 630 / 3 = 210
930 + 210 = 1140
Jack has 1140 chickens on his farm

[MathIzzzFun]

Musicstar:

Hi,


Please help . How to get 3 units?


Question: Jack and Jill owned a chicken farm each. If Jack and Jill sold 60 chickens and 30 chickens respectively in a day, Jack would have 300 chickens left when Jill has sold all her chickens. If Jack sold 30 chickens a day and Jill sold 60 chickens a day, Jack would have 930 chickens left when Jill has sold all her chickens. Find the number of chickens Jack has on his farm.

Answer : 3 u = 930 - 300 = 630
1u = 630 / 3 = 210
930 + 210 = 1140
Jack has 1140 chickens on his farm

similar questions were discussed before ..

A farmer has some chickens and ducks. If he sells 2 chickens and 3 ducks every day, there will be 50 chickens left when all the ducks have been sold. If he sells 3 chcikens and 2 ducks every day, there will be 25 chickens left when all the ducks have been sold.
a) how many ducks are there?
b) how many chickens are there ?
at http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=6410

Vicky and Jane were given a certain amount of money to spend. If Vicky spent $90 and Jane spent $30, Vicky would have $100 left when Jane had spent all her money. If Vicky spent $30 and Jane spent $90, Vicky would have $580 left when Jane had spent all her money, Find the total amount of money given to Vicky and Jane.
at http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=27&t=6373&start=3960

Tammy and Sharon have some money. If Tammy spent $60 each day and Sharon spent $30 each day, Tammy is left with $400 when Sharon spent all her money. If Sharon spent $60 each day and Tammy spent $30 each day, Tammy is left with $1150 when Sharon spent all her money. How much money do the two girls have?
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=4200

here are 4 possible approaches to tackle such questions:

http://i47.tinypic.com/143n9rb.png\">

http://i49.tinypic.com/w9dtt2.png\">

cheers.

[Musicstar]

HI MathizzzFUn,


Thank you very much for sharing all the method.

MathIzzzFun:

Musicstar:

Hi,

Please help . How to get 3 units?


Question: Jack and Jill owned a chicken farm each. If Jack and Jill sold 60 chickens and 30 chickens respectively in a day, Jack would have 300 chickens left when Jill has sold all her chickens. If Jack sold 30 chickens a day and Jill sold 60 chickens a day, Jack would have 930 chickens left when Jill has sold all her chickens. Find the number of chickens Jack has on his farm.

Answer : 3 u = 930 - 300 = 630
1u = 630 / 3 = 210
930 + 210 = 1140
Jack has 1140 chickens on his farm

similar questions were discussed before ..

A farmer has some chickens and ducks. If he sells 2 chickens and 3 ducks every day, there will be 50 chickens left when all the ducks have been sold. If he sells 3 chcikens and 2 ducks every day, there will be 25 chickens left when all the ducks have been sold.
a) how many ducks are there?
b) how many chickens are there ?
at http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=6410

Vicky and Jane were given a certain amount of money to spend. If Vicky spent $90 and Jane spent $30, Vicky would have $100 left when Jane had spent all her money. If Vicky spent $30 and Jane spent $90, Vicky would have $580 left when Jane had spent all her money, Find the total amount of money given to Vicky and Jane.
at http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=27&t=6373&start=3960

Tammy and Sharon have some money. If Tammy spent $60 each day and Sharon spent $30 each day, Tammy is left with $400 when Sharon spent all her money. If Sharon spent $60 each day and Tammy spent $30 each day, Tammy is left with $1150 when Sharon spent all her money. How much money do the two girls have?
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=4200

here are 4 possible approaches to tackle such questions:

http://i47.tinypic.com/143n9rb.png\">

http://i49.tinypic.com/w9dtt2.png\">

cheers.

[Oldschool]

Musicstar:

Hi,


Can someone help to explain the following questions? Although my girl is already P6 but I have been doing this type of questions but still do not understand when to \"+\" and \"-\". How do I look at the question to understand? Can someone enlighten me to better understanding? My girl has this question wrong. I think she also still not sure how to do it. Sorry, it may be an easy question for others. Thank you for helping to explain.

Questions: Vicky and her sister have a sum of money . If Vicky gives $120 to her sister, she will have 3 times as much money as her sister. If Vicky gives an additional $40 to her sister, she will have $240 more than her sister . How much money does her sister have?

Answer : 2u = 40 +40+40 = $320
1 u = 160
160 - 120 =40
Her sister has $40.

Hi,

The person who gives will have that sum deducted from his/her share.

Likewise, the person who receives will have that sum added to his/her share.

For a start, it is good to draw table/model and fill it in with the information/clue given.

Perhaps then, it would easier to follow/see and determine what other information is needed to help solve the problem.

Regards

http://www.flickr.com/photos/94858125@N03/8651246076/sizes/c/in/photostream/

[tianzhu]

PapayaDad:

Hi tianzhu,


I learn from your blog too. Thanks a lot.

Hi PapayaDad

So paiseh , actually, the blog was not set up by me because I don’t know how to blog.

You know lah, old man already, only know of “blocks’ in life, not “blogs”

It was Chief who helped to transfer the post from the P5 thread to the blog.

Best wishes

[Easy-going]

Hi

Please help me with this question. Thank you very much in advance.
Question 14 (Rosyth CA 1 2012 Paper Two)
Jack, Meili and Raj shared some 50-cent coins.
They each had an average of 28 coins.
The total amount of money that Jack and Meili had was $7 more than the total amount of Jack and Raj had.
If Raj’s amount was 4 times of Jack’s amount, how much more money did Meili have than Jack?

[PapayaDad]

Cannot get round number leh…

My method:
Average = 28 coins
Total = 28 x 3 = 84 coins = $42

J+M=J+R+7 so M=R+7
R=4J

J=u
R=4u
M=4u+7
Total = 9u+7 = 42
u=3.8888?

[Chalupa]

(I need help for this question !) Mr. Lee left town at 6.45am and drove at a uniform speed of 60km/h to Town Q.Mrs Chen left town P at 7:15am and drove towards Town Q along the same expressway as Mr Lee.She passed him at 10:15am and continued driving at the same speed until she reached Town Q.The distance between Town P to Town Q was 560km.How far was Mr Lee from Town Q when Mrs Chen reached Town Q ?

Thanks in advance.

[PapayaDad]

Mr.Lee left town P at 6.45am? did u miss the P?


Also the correct thread for these is here :

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=8950