Q&A - P5 Math

[ttyh]

MathIzzzFun:

ttyh:

5/11 of the children at a party like chocolate ice cream. 1/3 as many children like vanilla ice cream as those who like strawberry ice cream. There are 182 more children who like chocolate ice cream than vanilla ice cream. How many children are there at party altogether?

Pls help to advise if can solve this via model or via fraction method?
Thanks

you can use any approach - fraction, ratio, model, units..

using fraction:
children who like chocolate ice-cream --> 5/11 total
children who like vanilla and strawberry ice-cream--> 6/11 total
children who like vanilla ice cream --> 1/4 x 6/11 = 6/44 total
children who like strawberry ice cream --> 3/4 x 6/11 = 18/44 total
5/11 - 6/44 = 14/44
14/44 total --> 182
Total number of children = 182/14 x 44 = 572

using ratio:
children who like chocolate : total : vanilla & strawberry = 5 : 11 : 6 = 10u : 22u : 12u
children who like vanilla : strawberry = 1 : 3 = 3u : 9u (total 12u)
10u - 3u = 7u --> 182
total number of children = 22/7 x 182 = 572

cheers.

You wrote \"children who like vanilla ice cream --> 1/4 x 6/11 = 6/44 total \"
can u help to explain how the 1/4 is being derived? Thanks

[MathIzzzFun]

ttyh:

MathIzzzFun:

[quote=\"ttyh\"]5/11 of the children at a party like chocolate ice cream. 1/3 as many children like vanilla ice cream as those who like strawberry ice cream. There are 182 more children who like chocolate ice cream than vanilla ice cream. How many children are there at party altogether?

Pls help to advise if can solve this via model or via fraction method?
Thanks

you can use any approach - fraction, ratio, model, units..

using fraction:
children who like chocolate ice-cream --> 5/11 total
children who like vanilla and strawberry ice-cream--> 6/11 total
children who like vanilla ice cream --> 1/4 x 6/11 = 6/44 total
children who like strawberry ice cream --> 3/4 x 6/11 = 18/44 total
5/11 - 6/44 = 14/44
14/44 total --> 182
Total number of children = 182/14 x 44 = 572

using ratio:
children who like chocolate : total : vanilla & strawberry = 5 : 11 : 6 = 10u : 22u : 12u
children who like vanilla : strawberry = 1 : 3 = 3u : 9u (total 12u)
10u - 3u = 7u --> 182
total number of children = 22/7 x 182 = 572

cheers.

You wrote \"children who like vanilla ice cream --> 1/4 x 6/11 = 6/44 total \"
can u help to explain how the 1/4 is being derived? Thanks[/quote]5/11 total like chocolate
remainder (=6/11 total) like vanilla and strawberry

of the remainder (total 4 parts-1 part vanilla + 3 parts strawberry),
1 part likes vanila --> 1/4 remainder = 1/4 x 6/11 total
3 parts likes strawbarry --> 3/4 remainder = 3/4 x 6/11 total

using model:

http://i45.tinypic.com/359bmdi.png\">

cheers.

[snowball]

quote]


You wrote \"children who like vanilla ice cream --> 1/4 x 6/11 = 6/44 total \"
can u help to explain how the 1/4 is being derived? Thanks[/quote]

1/3 as many children like vanilla ice cream as those who like strawberry ice cream

My understanding is, 1/3 like vanilla and 2/3 like strawberry!! :sad:

Above english sentence make me confused! Worried that the kids might interpret wrongly if their english is as lousy as mine

[Trina]

MathIzzzFun:

Trina:

Please assist with this question:

There are 40 pupils in a class. Each boy donated $3 and each girl donated $2. The boys donated $30 more than the girls.
How many boys are there?
How many girls are there?

Thanks!

http://i49.tinypic.com/29qd1g3.png\">

cheers.

Many thanks MathIzzzFun!!
:thankyou:

[janicelhl]

Please help me solve this problem:


If Larry give $12 to Alice, he will have five times as much as Alice. If Alice gives $12 to Larry, she will have 1/3 of the amount Larry has. How much money does Alice have at first?

[tianzhu]

janicelhl:

Please help me solve this problem:


If Larry give $12 to Alice, he will have five times as much as Alice. If Alice gives $12 to Larry, she will have 1/3 of the amount Larry has. How much money does Alice have at first?

Hi

You may wish to check your question from the source again.

It's more logical if it is phrased as \"If Larry give another $12 to Alice, he will have three times as much as Alice.\"

Best wishes

[janicelhl]

Thanks tianzhu, I will ask my son to check with the teacher again. I am wondering is there any book in the shop that help me to solve the P5 level math.?

[AtoZ]

Please help:


Mr. Lim had some stickers and stamps for his class. The number of stickers was half as many as the number of stamps. After each pupil in the class had received 3 stickers and 8 stamps from Mr. Lim, he had 39 stickers and 2 stamps left. What as the total number of stickers and stamps Mr. Lim had at first?

Thank you!

[tianzhu]

AtoZ:

Please help:


Mr. Lim had some stickers and stamps for his class. The number of stickers was half as many as the number of stamps. After each pupil in the class had received 3 stickers and 8 stamps from Mr. Lim, he had 39 stickers and 2 stamps left. What as the total number of stickers and stamps Mr. Lim had at first?

Thank you!

Hi

This question has been discussed before.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7214/6994422784_250a9bcd20_z.jpg\">

[snowball]

tianzhu:

AtoZ:

Please help:


Mr. Lim had some stickers and stamps for his class. The number of stickers was half as many as the number of stamps. After each pupil in the class had received 3 stickers and 8 stamps from Mr. Lim, he had 39 stickers and 2 stamps left. What as the total number of stickers and stamps Mr. Lim had at first?

Thank you!

Hi

This question has been discussed before.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7214/6994422784_250a9bcd20_z.jpg\">

mmm....is there another easier model or explanation to this qn? i dont understand the model