Q&A - PSLE Math

[Brenda10]

Hi ck123,


Just to share DD's working for RGS Q14b:

2.5 x 2 = 5
1.4 x 2 = 2.8
5 x 2.8 = 14

Answer: 14 cm2

Hope the above is useful.

[ck123]

Hi Brenda 10


Thanks for the working. I got it.

Hi Tian zhu

I will try again with the picture upload.

Thanks all

[Brenda10]

ck123:

Hi Brenda 10


Thanks for the working. I got it.

Hi ck123,

You're welcome!

[PiggyLalala]

ck123:

:thankyou: tianzhu


Can u help to explain how to see Radius of semi-circle is 11.75 :scratchhead: for Q17

Join the points OT and draw a vertical line from B to the horizontal line OD.

You can see that the 2 small right angled triangles are identical.
Therefore OT = BD = 11.75 cm
That is radius of the semicirlce = 11.75

[Heeheehaha]

Pls help to solve the following :-

Alan had some apples and oranges. There were 75 more apples than oranges. After he sold 4/5 of the apple & 3/4 of the oranges, he had 285 fruits left. How many apples did he have at 1st？

[Verysuperkiasu]

Anyone tried raffles 2011 prelim paper? I don’t have a scanner. If any of you have the question for P2 Q 17, can you please share how to solve?


Thanks

[Heeheehaha]

Pls help to solve the following :-

Alan had some apples and oranges. There were 75 more apples than oranges. After he sold 4/5 of the apple & 3/4 of the oranges, he had 285 fruits left. How many apples did he have at 1st？

[ck123]

Thanks All


Ai yo , finally managed to see that the radius is the same as AD. Paiseh.

[MathIzzzFun]

Daddy:

Thanks MathIzzzFun

Q2.

http://i56.tinypic.com/2mgwklt.jpg\">

cheers.[/quote]

How did you get 3: 2 ratio of Mary to John?
How about John bought 40% of the totalnumber of clips and ribbons?

I am not quiet understand. Sorry for that.[/quote]

Hi

John bought 40% of total number of ribbons and clips, so Mary bought 60% of total number of ribbons and clips.
Ratio of total number bought by Mary to John = 60 : 40 = 3:2

cheers.

[tianzhu]

Heeheehaha:

Pls help to solve the following :-

Alan had some apples and oranges. There were 75 more apples than oranges. After he sold 4/5 of the apple & 3/4 of the oranges, he had 285 fruits left. How many apples did he have at 1st？

Hi

You may use MD or UM to do it.

Apples ----- 20 units + 75
Apples sold ------ 16 units + 60
Apples left ------ 4 units + 15

Oranges ----- 20units
Oranges sold ------ 15 units
Oranges left ------ 5 units

5 units + 4 units + 15 ----- 285
1 unit ------ 30

Number of apples ------ (20*30) + 75 --------675

Best wishes