Q&A - PSLE Math

[jtparent]

Hi,


Pse assist.

Question: I have 38 notes in my wallet. Some of them are $10 notes. The rest are $2 notes. The total value of these notes is $228.
A) how many $10 notes are there in my wallet?
B) find the difference between the total value of the $10 and $2 notes.

TIA

[YumYum]

Hi, can anyone pls help with this Qn:


thanks http://i40.tinypic.com/vxzvbl.jpg\">

[YumYum]

Hi, need help with this one as well: http://i43.tinypic.com/2wmi8hd.jpg\">

[Symum]

Hi,

Please help!
Lincoln spent $95 of his pocket every month and saved the rest. This month, he decided to spend only $75, thereby increasing his savings by 40%.
(a) What was his pocket money every month?
(b) Find the ratio of his expenditure to his savings for this month.

Karen, Nora and Sakina baked a total of 280 tarts. Karen baked 1/4 as many tarts as Nora. Nora baked 4/5 as many tarts as Sakina. What percentage of the total number of tarts did Nora bake?

At city hall station, there were 360 commuters on an Mrt train. There were 20% more children than men and 20% fewer women than men on the train. 120 more commuters boarded the train at the next station. The number of women increased by 50% and the number of children increased by 25%. What was the percentage increase in the number of men?

Thanks

[MathIzzzFun]

jtparent:

Hi,


Pse assist.

Question: I have 38 notes in my wallet. Some of them are $10 notes. The rest are $2 notes. The total value of these notes is $228.
A) how many $10 notes are there in my wallet?
B) find the difference between the total value of the $10 and $2 notes.

TIA

Hi

using area model...

http://i43.tinypic.com/33n9lsp.jpg\">

cheers.

[MathIzzzFun]

YumYum:

Hi, can anyone pls help with this Qn:


thanks http://i40.tinypic.com/vxzvbl.jpg\">

Hi

area ADF --> 2u
area CDF --> 4u
area CFA --> 6u
area CFB = area CFA
area CFB --> 6u
area CDB --> 4u + 6u = 10u
area ADB --> 1/2 x 10u = 5u
area AFE = area BFE --> (5u-2u)/2 = 1.5u
area ADFE --> 3.5u
so, 3.5u --> 35 cm2, 1u --> 10 cm2
total area ABC --> 15u --> 150 cm2

cheers.

cheers.

[MathIzzzFun]

YumYum:

Hi, need help with this one as well: http://i43.tinypic.com/2wmi8hd.jpg\">

Hi

shaded area = area of semi-circle --> to visualize this - try to duplicate the circles so that you get a \"6-petal flower\" in the centre circle

cheers.

[MathIzzzFun]

Symum:

Hi,

Please help!
Lincoln spent $95 of his pocket every month and saved the rest. This month, he decided to spend only $75, thereby increasing his savings by 40%.
(a) What was his pocket money every month?
(b) Find the ratio of his expenditure to his savings for this month.

Thanks

Hi

Increase in savings --> $20
40% of savings --> $20
140% of savings --> $70

a) Pocket money = $75 + $70 = $ 145
b) ratio of expenditure to savings for this month = 75 : 70 = 15 : 14

cheers.

[MathIzzzFun]

Symum:

Hi,



Karen, Nora and Sakina baked a total of 280 tarts. Karen baked 1/4 as many tarts as Nora. Nora baked 4/5 as many tarts as Sakina. What percentage of the total number of tarts did Nora bake?


Thanks

Hi

Karen --> 1 unit
Nora --> 4 units
Sakina --> 5 units
Total 10 units

4/10 x 100% = 40%
Nora baked 40% of the tarts.

cheers.

[MathIzzzFun]

Symum:

Hi,



At city hall station, there were 360 commuters on an Mrt train. There were 20% more children than men and 20% fewer women than men on the train. 120 more commuters boarded the train at the next station. The number of women increased by 50% and the number of children increased by 25%. What was the percentage increase in the number of men?

Thanks

Hi

children : men --> 120 : 100 = 6 : 5
men : women --> 100 : 80 = 5: 4
children : men : women --> 6u : 5u : 4u
Total 15u --> 360, 1u --> 24
children --> 144
men --> 120
women --> 96
of 120 commuters boarded,
number of men boarded = 120 - 1/2 x 96 - 1/4 x 144 = 36
percentage increase in number of men = 36/120 x 100% = 30%

cheers.