Q&A - PSLE Math

[Publica]

Hi Vanilla Cake,


Can you help to verify the answer for Q12b of Nan Hua Maths preliminary paper? Thanks.

[mrswongtuition]

raghupavithra:

kasey needed to make 120 bows for prize giving.she used 12.4 cm to make a bow.she bought 3 rolls of ribbon,each 5 m long.find the lenghth of the ribbon she had left.

Each bow: 12.4cm
120 bows: 12.4cm x 120 = 1488cm = 14.88m

Each roll of ribbon: 5m
3 rolls of ribbon: 15m

15m - 14.88m = 0.12m left = 12cm left

[zsqchx]

Vanilla Cake:

zsqchx:

Could someone help me to solve Q.27 for Henry Park prelim 2011 paper1? Thank you.

Pls refer to http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=48&t=14433&p=582309 for the worked solution.

Hi, Vanilla Cake,

Thank you for your help!

[atutor2001]

ozora:

Mr Lee bought some shirts for $425. if He was given a discount of 15%, he would be able to buy 5 more shirts for the same amount of money. What is the original price of shirt?

is it equate 85%=>425
100% -> 500?
then how?

With 15% discount he would have 15/100 x 425 = $637.75 left

This $63.75 can buy 5 more shirts at discounted price.

Discounted price of 1 shirt = 63.75/5 = $12.75

85% -> 12.75
100% -> 100/85 x 12.75 = $15 (original price of 1 shirt)

[Vanilla Cake]

Publica:

Hi Vanilla Cake,

Can you help to verify the answer for Q12b of Nan Hua Maths preliminary paper? Thanks.

Hi Publica,
Sure and answer for Q12b of Nan Hua 2011 P6 Prelim Maths is 20 degree.

[atutor2001]

raghupavithra:

it takes Mr Adams 20 minutes to saw a pole into 5 equal pieces how many minutes would it take him to saw another similar pole into 10 equal pieces?



how to solve this/

To divide a pole into 5 pieces, we need to make 4 cuts only.
To divide a pole into 10 pieces, we need to make 9 cuts only.

4 cuts -> 20 minutes
1 cut -> 5 minutes
9 cuts -> 45 minutes (you will have 10 pieces)

[Vanilla Cake]

For interested readers who have no access for this question 12 from Nan Hua Primary School 2011 P6 Prelim Maths Paper 2:

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[htn]

tianzhu:

htn:

tianzhu
how to use MD to solve this q? can teach me?
TIA

Hi mumwgals and htn

MD refers to “Model Drawing” or Model Diagram”.

In this question, the units or boxes showing boys and girls in the parade ground and indoor hall are of different measures. They are not of the same sizes.

A student should note that the number of boys and girls remains the same before and after the transfer. The total number of 1000 did not change at all.

There are two unknowns with two linear equations.Recall the time at lower primary when you’re using the stars and moons, you could actually solve the equations pictorially as shown in the slide. This question is crafted in such a way that it is pretty neat to use MD.

Otherwise, students may choose to work using “Units and Parts” or letters of the alphabet as representation. Use the method you are comfortable with.

Hope this helps.

Best wishes

http://farm7.static.flickr.com/6070/6154555481_a1f43e1359_z.jpg\">

tianzhu

thanks.

[htn]

Hi Vanilla Cake,


Can you help, how to solve the answers for Q10 and Q11 of Nan Hua Maths preliminary paper? TIA

[Heeheehaha]

Any parents have SHHK Prelim 2011 answer sheet for all subject ?


TIA !