Q&A - PSLE Math

Academic support for Primary 6 and PSLE
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BrownBelt
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Re: Q&A - PSLE Math

Post by speedmaths.com » Tue Jun 14, 2016 2:03 pm

Ice watch wrote:
Sruthi wrote:Please help with the question Image

Image
The question asked for "this year", and NOT "last year."

Cheers


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RJ_164
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Re: Q&A - PSLE Math

Post by RJ_164 » Tue Jun 14, 2016 6:41 pm

Please help with this question.

Jared packed some sweets and chocolates into gift bags as door gifts for his birthday party. He tried
putting every 2 sweets with 1 chocolate into a bag and found that he had 30 chocolate left. When he put every 2 sweets with 2 chocolates, he needed another 50 chocolates. How many sweets and chocolates did he have altogether?

nicnac
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Re: Q&A - PSLE Math

Post by nicnac » Tue Jun 14, 2016 7:01 pm

RJ_164 wrote:Please help with this question.

Jared packed some sweets and chocolates into gift bags as door gifts for his birthday party. He tried
putting every 2 sweets with 1 chocolate into a bag and found that he had 30 chocolate left. When he put every 2 sweets with 2 chocolates, he needed another 50 chocolates. How many sweets and chocolates did he have altogether?
To put one more chocolates in each bag, he will need 80 chocolates. So he has a total of 80 gift bags.
Total chocolates and candies he had 270 (3*80 + 30).

dido
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Re: Q&A - PSLE Math

Post by dido » Tue Jun 14, 2016 7:10 pm

Hi,

I am trying to help my P6 child in his Math revision, but I couldn't solve. Can someone help? Thanks a million. :shrug:

Image

Image

God Bless

EconsPhDTutor
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Re: Q&A - PSLE Math

Post by EconsPhDTutor » Tue Jun 14, 2016 7:41 pm

dido wrote:Hi,

I am trying to help my P6 child in his Math revision, but I couldn't solve. Can someone help? Thanks a million. :shrug:

Image

God Bless

15(a) 14 cm × 756.25 cm² =10,587.5 cm³.

15(b) Let X be the water level of Tank B after all the pouring is done.

Then (X - 20) cm is the increase in the water level of Tank B and (28 - X) cm is the decrease in the water level of Tank A.

If the water level in Tank A falls by 1 cm, then its volume decreases by 1 cm × 756.25 cm² = 756.25 cm³.

If the water level in Tank B rises by 1 cm, then its volume increases by 1 cm × 5 cm × 5 cm = 25 cm³.

We know moreover that the increase in volume of water in Tank B equals the decrease in volume of water in Tank A. Therefore:

(X - 20) × 25 = (28 - X) × 756.25.

Do the algebra:

⇒ (25 + 756.25) X = 28 × 756.25 + 20 × 25

⇒ 781.25X = 21675

⇒ X = 27.744.

Hope this helps and feel free to ask for any clarifications.

- Dr. Choo Yan Min

www.EconsPhDTutor.com

If you found this answer helpful, then please help me out by spreading word of my services. I’m a new tutor in Singapore so I need some help getting word out! Thank you!


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Re: Q&A - PSLE Math

Post by EconsPhDTutor » Tue Jun 14, 2016 8:18 pm

dido wrote:Hi,

I am trying to help my P6 child in his Math revision, but I couldn't solve. Can someone help? Thanks a million. :shrug:

Image

God Bless
13. I interpret this question to be asking for the length of the perimeter of Figure 1 with which Ball A comes into contact, during its journey.

This length is highlighted in red, green, and blue colours in the figure below.

The red lengths on the left and right sides simply add up to 2 × 15 cm = 30 cm.

The green length on the upper side is 38 cm - 2 × 7 cm = 24 cm. The blue length on the upper side is half the circumference of the circle: π̶r̶=̶ ̶3̶.̶1̶4̶ ̶×̶ ̶7̶ ̶=̶ ̶2̶1̶.̶9̶8̶ I made a mistake here previously of using the diameter instead of the radius. Now corrected: πr= 3.14 × 7 × 0.5 = 10.99.

Altogether, the green and blue lengths on the upper side add up to 34.99 cm.

Symmetrically, the green and blue lengths on the lower side add up to 34.99 cm.

Altogether then, the total length is 30 + 34.99 + 34.99 = 99.98 cm.

Image

Hope this helps and feel free to ask for any clarifications.

- Dr. Choo Yan Min

www.EconsPhDTutor.com

If you found this answer helpful, then please help me out by spreading word of my services. I’m a new tutor in Singapore so I need some help getting word out! Thank you!
Last edited by EconsPhDTutor on Wed Jun 15, 2016 9:21 am, edited 1 time in total.

dido
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Re: Q&A - PSLE Math

Post by dido » Tue Jun 14, 2016 8:40 pm

Hi Dr Choo,

Thanks so much for your help. For question 13, the answer in answer sheet is 99.98cm. I think it could be wrong, I am not sure. Nevertheless, we thank you for helping us solve it.

Thanks
Dido

speedmaths.com
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Re: Q&A - PSLE Math

Post by speedmaths.com » Tue Jun 14, 2016 10:18 pm

EconsPhDTutor wrote:
dido wrote:Hi,

I am trying to help my P6 child in his Math revision, but I couldn't solve. Can someone help? Thanks a million. :shrug:

Image

God Bless
13. I interpret this question to be asking for the length of the perimeter of Figure 1 with which Ball A comes into contact, during its journey.

This length is highlighted in red, green, and blue colours in the figure below.

The red lengths on the left and right sides simply add up to 2 × 15 cm = 30 cm.

The green length on the upper side is 38 cm - 2 × 7 cm = 24 cm. The blue length on the upper side is half the circumference of the circle: πr= 3.14 × 7 = 21.98.

Altogether, the green and blue lengths on the upper side add up to 45.98 cm.

Symmetrically, the green and blue lengths on the lower side add up to 45.98 cm.

Altogether then, the total length is 30 + 45.98 + 45.98 = 121.96 cm.

Image

Hope this helps and feel free to ask for any clarifications.

- Dr. Choo Yan Min

www.EconsPhDTutor.com

If you found this answer helpful, then please help me out by spreading word of my services. I’m a new tutor in Singapore so I need some help getting word out! Thank you!
Hi,

The blue length on the upper side is half the circumference of the circle:
πr= 3.14 × 7 x 1/2 = 21.98 x 1/2 = ???.

Cheers



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Sruthi
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Re: Q&A - PSLE Math

Post by Sruthi » Wed Jun 15, 2016 8:01 am

Hi friend,
I cant understanc the explanation ,why 13u is used and for male why it is divided into 5 parts and female 6 parts . Can you please help to explain ?

dido
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Re: Q&A - PSLE Math

Post by dido » Wed Jun 15, 2016 9:15 am

Hi Speedmath,

Thanks for helping.

Regards

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