PSLE - New Format for Maths

[atutor2001]

thelims:

2. Joe bot some chocolates and gave some to Ken. Ken bot some sweets and gave some to Joe.

Joe ate 12 sweets and Ken ate 18 chocolates. The ratio of sweets to chocolates Joe had became 1:7 and the ratio of sweets to chocolates Ken had became 1:4.

How many sweets did Ken buy?

Thanks for the question. Your version is correct and the answer for the number of sweets that Ken bought is 68.

[atutor2001]

kohjl:

According to my son, this is Q18 of Paper 2 (last question). The question is correct except for the names of the children (which of course is not important for calculation purposes). No other additional information was given.

My son's answer was 68.

Please see my earlier post. The question is incomplete. Congratulation your son's answer is correct.

[Vanilla Cake]

kohjl:

atutor2001:

[quote=\"YGmama\"]here's de question for sweets and chocolate


Jane bought a packet of sweet and gave half to Sunny.
Sunny boiught a packet of chocolate and gave half to Jane.
Jane ate 12 chocolates, and Sunny ate 48 sweets. How many sweets did Jane buy?

This can't be the question. Not enough information

According to my son, this is Q18 of Paper 2 (last question). The question is correct except for the names of the children (which of course is not important for calculation purposes). No other additional information was given.

My son's answer was 68. He used algebra to form an equation, but maybe it can be done by other methods. (Sorry, I can't explain more clearly as I didn't fully understand what my son said :oops: )

Can Vanilla Cake help? Thanks. :D[/quote]Hi kohjl,
Q18 of paper 2 (last question) is something like this and I think that your son has got the right answer ( 68 ).Here it goes (not in exact words):

Q18
Jim bought some chocolates and gave half of it to Ken. Ken bought some sweets and gave half of it to Jim.Jim ate 12 sweets and Ken ate 18 chocolates.The ratio of Jim's sweets to chocolates became 1 : 7 and the ratio of Ken's sweets to chocolates Ken became 1:4.How many sweets did Ken buy?

Suggested solutions
Draw a model to show \"after eating\" scenario, \t\t
\t\t\t
Ratio of Jim's sweets to chocolate (1:7)
Sweets []
Chocos [][][][][][][]

Ratio of Ken's sweets to chocolate (1:4)
Sweets [] +12 (+12 refers to the sweets eaten by Jim)\t\t\t
Chocos [][][][] (+12x4) - x 4 times
\t
Both amount of Chocolates are the same,so
(7-4) units = (12x4) + 18 (18 chocolates were eaten by Ken)
3 units = 66
1 unit = 22\t\t
\t\t\t
Amount of sweets bought by Ken->(unit +12)x2=(22+12) x 2 =68

Or use algebra which is easier.

Assume that sweets that Ken bought was S and chocolates that bought by Jim was C.

Before both of them ate, they had:
Ken -> 0.5C + 0.5S
Jim -> 0.5C + 0.5S
as each of them gave 1/2 to each other.

Jim ate 12 sweets and the ratio of Jim's sweets to chocolates became 1:7.
(0.5S-12)/0.5C = 1/7
3.5S-84=0.5C

Ken ate 18 chocolates and the ratio of Ken's sweets to chocolates became 1:4.
0.5S/(0.5C-18 ) = 1/4
(0.5C-18 ) / 0.5S = 4
0.5C-18 = 2S

3.5S-84-18=2S
3.5S-2S = 84+18
1.5S = 102
S = 102/1.5 = 68

Amount of sweets bought by Ken-> 68

[kohjl]

atutor2001:

Please see my earlier post. The question is incomplete. Congratulation your son's answer is correct.

Oops, sorry! You are right, the question was incomplete.

[kohjl]

Vanilla Cake:

kohjl:

Can Vanilla Cake help? Thanks.

Hi kohjl,
Q18 of paper 2 (last question) is something like this and I think that your son has got the right answer ( 68 ).Here it goes (not in exact words)....

Thanks, Vanilla Cake. You have been most helpful yet again! :goodpost:

[kiasiparent]

kohjl:

atutor2001:

[quote=\"YGmama\"]here's de question for sweets and chocolate


Jane bought a packet of sweet and gave half to Sunny.
Sunny boiught a packet of chocolate and gave half to Jane.
Jane ate 12 chocolates, and Sunny ate 48 sweets. How many sweets did Jane buy?

This can't be the question. Not enough information

According to my son, this is Q18 of Paper 2 (last question). The question is correct except for the names of the children (which of course is not important for calculation purposes). No other additional information was given.

My son's answer was 68. He used algebra to form an equation, but maybe it can be done by other methods. (Sorry, I can't explain more clearly as I didn't fully understand what my son said :oops: )

Can Vanilla Cake help? Thanks. :D[/quote]Jane bought a packet of sweet and gave half to Sunny.
Sunny bought a packet of chocolate and gave half to Jane.
Jane ate 12 chocolates, and Sunny ate 48 sweets. The ratio of sweets to chocolates Jane had became 1:7 and the ratio of sweets to chocolates Sunny had became 1:4. How many sweets did Jane buy?

[Mandy-Alex]

justsay:

mathsparks:

Speed Q is 11.06am

Raj's pay is $60 (It's part a which is $1170)
Curry puff and average height same.

Mathsparks' son.
Good luck for remaining subjects.

11.06am - same
$60 - same
Curry puff 71 - same
geomertry - 120 ( same as 2 of her classmates, some get 150)
paper 2 last question - 36

Geometry - 150, I am mum, who loves maths, so I got like ans 150 degrees.

[Ultra KS]

Think all of us should go and sleep. Very late already

(Hokkien: ka kin ke kun, wa liao. )

[High-Schooler]

Nvm, cause the grading scheme will go down so even if you have, like, 70, and the paper is REALLY difficult, it may even be a A/A*, so it just depends on the standard of the entire cohort. jyjy !

^^

[James Ang]

atutor2001:

James Ang:

If there is no moderation, I estimate only 2% to 3% of the students can get A* based on actual marks. PSLE Maths is a challenging but worthy examination.


I am sure this year's batch of students did their best, so all the best, while next year's batch of P6 students have learnt from the experience of this year's pioneer batch which is allowed to use the scientific calculator to do Maths.

So, all your students must be in the 2% to 3% of A stars as they know how to check their works with calculator and are well prepared.

Don't worry for my students, last year many of my students get A* for Maths. Come and look for me I'll show you. Do Maths must have confidence, skill and passion. My students are the bright ones, I am only a coach, the students are the heros. I always tell my students if I am smarter than them it is of no use to them because I cannot take their exams for them, they have to learn to be independent and take their own exams.

By the way I have A* for Maths in my own PSLE, A for both AMaths and EMaths (and triple science) for O levels, A for CMaths at A levels. My Maths is ok ok only.