Q&A - P5 Math (Page 173)

Q&A - P5 Math

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Re: Q&A - P5 Math

Postby Sharmum » Thu Jan 31, 2013 6:44 pm

Hi,

Please help....

Q1) Limeng is 10 years old and his sister is 7 years old . In how many years' time will their total age be 41 years?

Q2) A basket with 65 sweets has a mass of 3200g . The same basket with 40 sweets has a mass of 2125g. Each sweet has the same mass . What is the mass of the basket?


Many thanks!
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Re: Q&A - P5 Math

Postby Trina » Thu Jan 31, 2013 7:39 pm

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!
Trina
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Re: Q&A - P5 Math

Postby MathIzzzFun » Thu Jan 31, 2013 7:42 pm

Sharmum wrote:Hi,

Please help....

Q1) Limeng is 10 years old and his sister is 7 years old . In how many years' time will their total age be 41 years?

Q2) A basket with 65 sweets has a mass of 3200g . The same basket with 40 sweets has a mass of 2125g. Each sweet has the same mass . What is the mass of the basket?


Many thanks!


Q1.
Total age now --> 10+7=17
(41-17)/2 = 12 ...(both grow older by the same number of years)
Their total age will be 41 years in 12 years' time.

Q2.

Mass of (65-40)= 25 sweets --> 3200g - 2125g = 1075g
mass of 1 sweet --> 43g
Mass of basket --> 2125g - 40 x 43g = 405g

cheers.
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Re: Q&A - P5 Math

Postby elisammom » Thu Jan 31, 2013 7:43 pm

tianzhu wrote:
elisammom wrote:Hi pls help. This is the 2011 CA1 Nanhua paper
Image
TIA

Hi
You may use "Listing"

Total number of students for A, C,D and E ------- 77

Find multiples of 5 and 7 after 77

Multiples of 5 ------ 80,85,90,95

Multiples of 5 + 1 ------ 81,86,91,96

Multiples of 7 ------ 84, 91

Multiples of 7 + 5 ------ 89, 96

The common number is 96

Least number of students in B ------- 96-77 ------- 19

Hope this helps

Best wishes



Very clear! Thanks a lot!
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Re: Q&A - P5 Math

Postby MathIzzzFun » Thu Jan 31, 2013 7:49 pm

Trina wrote: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!


Assume all boys donated, total amount --> 40 x $3 = $120
$120 - $30 = $90 --- excess amount to be reduced by girls' donation
Number of girls = $90/($3+$2) = 18
Number of boys = 40-18 = 22

cheers.
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Re: Q&A - P5 Math

Postby Trina » Thu Jan 31, 2013 8:05 pm

MathIzzzFun wrote:
Trina wrote: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!


Assume all boys donated, total amount --> 40 x $3 = $120
$120 - $30 = $90 --- excess amount to be reduced by girls' donation
Number of girls = $90/($3+$2) = 18
Number of boys = 40-18 = 22

cheers.


Thanks but still dont get it.. Can provide narration? Thanks
Trina
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Re: Q&A - P5 Math

Postby ttyh » Thu Jan 31, 2013 9:01 pm

Luke had $140 and Issac had $92 at first. After they spent an equal amount of money, Luke had 4 times as much money as Isaac. How much did each of them spend?
(not sure if this has been asked before, pls refer me to correct page. Thanks!)
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Re: Q&A - P5 Math

Postby php » Thu Jan 31, 2013 9:10 pm

ttyh wrote:Luke had $140 and Issac had $92 at first. After they spent an equal amount of money, Luke had 4 times as much money as Isaac. How much did each of them spend?
(not sure if this has been asked before, pls refer me to correct page. Thanks!)


3 units -> $140 - $92 = $48
1 unit -> $48 / 3 = $16

$92 - $16 = $76

Each of them spent $76
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Re: P5 Onsponge Conquer Problem Sums Answer key

Postby Trevortan » Thu Jan 31, 2013 9:25 pm

If you need the whole answer key, I don't think I could help. But if you just need some answers from the answer key, then you can go to the website. http://www.onsponge.com/shop/online-solutions.html
Hope I helped
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Re: Q&A - P5 Math

Postby Oracle » Thu Jan 31, 2013 11:55 pm

Serene, Fabian and Eileen shared their prize money of $4100 among themselves. Twice of Serene's share was equal to 5 times of Fabian's share. 4 times of Serene's share was also equal to 3 times of Eileen's share. Calculate Serene's share.

Help ...... please. How should the answers be presented and is this really a P5 appropriate question?

Thank you very much.
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