Q&A - PSLE Math

[nothing2do]

MummyJamie:

I'm Jamie, child of my mum's account XD


PSLE Maths was tough for me. I was able to answer all the questions, though. For the angles/geometry one, most of my classmates got 120, 135 or 150. I used guess & check at first, but then used ratio and got 120. Anyone used ratio & got that too?

mine daughter also use ratio and get 120

[nani]

Anybody remembers the curry puff qn? :?

[CrazyDad]

Hey Folks, it is time to revise the Chinese. So go home…

[millan]

I remmember Q7. Curry puff shop sells puffs at $0.80.O50ffer:Buy 3 get 4th half price.If customer got $50, how many puffs can he buy if he buys as many as he can.


Ans: $2.40 ($0.80x3) + ($0.40) = $2.80
$50/$2.80=17R$2.40
$2.40/$0.80 = 3
17x3+3 = 54

Ans:54

[millan]

I need be reading help xia. (To all who maybe reading, I'm her son)

Q17 is tough. I put 120 degrees but top girl put 135 degrees. I not sure which is which - We've got about 8 Ans. If got ans or method pls post ASAP. supense is killing me. :stupid: :stupid: :stupid: :stupid: :stupid:

[Vanilla Cake]

millan:

I remmember Q7. Curry puff shop sells puffs at $0.80.O50ffer:Buy 3 get 4th half price.If customer got $50, how many puffs can he buy if he buys as many as he can.


Ans: $2.40 ($0.80x3) + ($0.40) = $2.80
$50/$2.80=17R$2.40
$2.40/$0.80 = 3
17x3+3 = 54

Ans:54

Hi millan,
1 'set' = 3x0.80+0.40 = $2.80
50/2.80 = 17 R 2.40
$2.40 = 240 cents
240 cents/80 cents = 3
17 x 4 + 3 = 71 as 1 set got 4 curry puffs (3 at $0.80 and 1 at $0.40).
With $50, he can buy as many as 71 curry puffs

[millan]

Vanilla Cake:

millan:

I remmember Q7. Curry puff shop sells puffs at $0.80.O50ffer:Buy 3 get 4th half price.If customer got $50, how many puffs can he buy if he buys as many as he can.


Ans: $2.40 ($0.80x3) + ($0.40) = $2.80
$50/$2.80=17R$2.40
$2.40/$0.80 = 3
17x3+3 = 54

Ans:54

Hi millan,
1 'set' = 3x0.80+0.40 = $2.80
50/2.80 = 17 R 2.40
$2.40 = 240 cents
240 cents/80 cents = 3
17 x 4 + 3 = 71 as 1 set got 4 curry puffs (3 at $0.80 and 1 at $0.40).
With $50, he can buy as many as 71 curry puffs

Yes. the father said is 71

[Muffins]

MummyJamie:

nani:

[quote=\"MummyJamie\"]Sally baked some cookies to sell. ¾ of them were chocolate cookies and the remaning were almond cookies. After she sold 210 chocolate cookies and 5/6 of the almond cookies, she had 1/5 of the cookies left. How many cookies did she sell?


That one was 960 right?

Most of us got that.

Yea, i hope so too
my daug didnt noe how 2 do the geometry qn...did u get 36 for the last qn? n 11:06am for the qn on spd??? >.< =.= thnx

Speed, yes, I got 11:06. For the last question, i got 68 T.T I think it's wrong.[/quote]Hi mummyjamie, answers are correct for both questions! Most people used ratios and cross multiplication/Sakamoto method to soolve the last question, I heard.

[Mandy-Alex]

Hei, Pupils, For the Q with the Curry puffs, the correct ans is 71. You should have 17x4, which is 68, plus 3 more curry puffs, which is 71.


For the Q17 which is geometry Q, ans. is 150 degrees.

For the Q with the cookies, all of you have got correct - 960, but my daughter has got wrong for that Q.

If somebody remembers some more Q-s, please, I will be happy to know ;D :lol:

[kiasiparent]

N3SKiasu:

The Speed question (if my DD remembered correctly):


Mei and Lin take part in a cycling race.
Mei's speed is 20km/h. When Lin travelled half of the distance, Mei was 3.5km in front of her.
Mei reached finishing line at 10.45am.
What time did Lin reach the finishing line?

Similar feedback - paper was tough, finished all but not a lot of time left to check through. Anyway, its over now, just move on and focus on next few papers.

So take the total distance to be 2 units.
When Mei travels 1 unit + 3.5km, lim would have travelled 1 unit.
When Mei travels 2 units + 7km, lim would have travelled 2 units. (just finished the race).

So Mei needs to overshot by 7km.

Time = Distance/Speed = 7/20 hours = 7/20 x 60 = 21 minutes.

Lim needs to run 21 mins more.

10.45 + 16 mins = 11.06am