Jurong West Primary - 5D and F: 2008

Tuesday, December 16, 2008

Challenging Mathematics Holiday Worksheets

Dear 5D and 5F pupils,

I believe you have already found out that there are some typo errors in the Holiday Mathematics worksheets given to you.

Please ignore those problems. We will change it when school reopens.

Regards,

Mdm Goh

Young Scientist Cards

Hi,

Below are the websites which you can look at when doing your Young Environmentalist card.

Pollution
http://library.thinkquest.org/C0111040/Types/types.php
http://environment.about.com/od/pollution/Environmental_Issues_Pollution.htm

Singapore water and waste water treatment plant
http://www.watertreatment.com.cn/plants/list/Singapore-Jurong-WRP.htm

Refuse Collecting Company
Eg
http://app.nea.gov.sg/cms/htdocs/category_sub.asp?cid=75

http://www.sembwaste.com/newsroom/20010208.shtml

Dengue Fever, Ades Mosquitoes, Mosquitoes Breeding sites, Prevention

http://www.dengue.gov.sg/subject.asp?id=10

Pest

http://www.pestworldforkids.org/index.html (great website)

(note : just copy and paste the web address onto the internet explorer address bar)

They are the answers to most of the questions. Happy surfing..

Enjoy the holidays.

Mdm Goh

Monday, October 20, 2008

Topical Test 14 : Volume (NEW)

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

WB Pg 126 Challenging Practice (NEW)

Workbook Review 5 (NEW)

Answer Key

1) a) 36

b) 9

2) Total : 139.8kg

Average = 139.8 ÷ 4 = 34.95kg

3) Total = 378.10

Average = 378.10 ÷ 5 = $75.62

4) Average = 645.7 litres ÷ 8 = 80.7125 » 80.7 litres

5) Perimeter = 14.8 x 4 = 59.2m

6)

7)

Total score = 92 x 4 = 368

A + B + C + D = 368

78 + 95 + 88 + D = 368

D = 368 - 78 - 95 - 88 = 107 points

10) a) 28% b) 72%

11) a) 67 b) 9/100 c) 9/50 d) 13/25

12) a) 47% b) 70%

c) 10% d) 77%

e) 7% f) 70%

13) 57 out of 100 = 57/100 = 57% = 0.57

3 out of 10 = 3 /10 = 30% = 0.3

14) a) 44% b) 90%

c) 51% d) 36%

15) a) 65% b) 64%

16) 100% - 82% = 18%

18% x 950 = 80/100 x 950 = 171 seats not occupied.

17)

100% - 30% - 28% = 42% --> 50cent coins

42% x $50 = 42/100 x $50 = $21

18)

19)

GST = 7% x $860 = $60.20

Total paid = GST + Price = $60.20 + 860 = $920.20

20)

Discount = 35%

Discounted price = 100% - 35% = 65%

Amount paid = 65% x 725.60 = $471.64

21)

Discounted price = 100% - 15% = 85%

Amount after discount = 85% x 4505 = $3829.25

Downpayment = 4% x 3829.25 = $153.17

Saturday, October 18, 2008

Term 3 Rev Paper 1 (Section C)

Question 36

Question 37

Question 38

Question 39

Questoin 40

Question 41

Question 42

Question 43

Question 44 a

Question 44b

Question 45

Question 46

Question 47

Question 48
coming soon....

Question 49
coming soon....

Question 50
coming soon....

Term 3 Rev Paper 1 (Section A & B)

***

Note : Ans for Qn 23 is changed to 381 and Qn 27 changed to 96 and Qn 19 changed to 66

SECTION A

Explanations:

Question 12

Question 16 - 202 000
Question 17 - 78
Question 18 - 4/11

Question 19 - 66 square cm

Question 20 - 72 degrees

Question 21 - 0.089
Question 22 - 7
Question 23 - 381 (Changed)

Question 24 - 79

Question 25 - $20

Question 26 - 1008

Question 27 - 98 square cm (changed)

Question 28 - 114 degrees

Question 29 - 45.6 kg
Question 30 - $764.80

Question 31 - 750
Question 32 - 25%
Question 33 - 403

Question 34 - 199 degrees
Question 35 - 12 cm

Email me if you need me to explain any question. Thanks

YE Rev Paper 3 (Section A and B)

NOTE : Below are just answer key. If you need detail explanations, please email me.

SECTION A

EXPLANATION FOR SECTION A:

Question 2

Question 4

Question 7

Question 11

Question 12

Question 16 - 140 degrees
Question 17 - 100
Question 18 - 0.05
Question 19 - 42
Question 20 - 40
Question 21 - 120
Question 22 - 15
Question 23 - 216
Question 24 - 125
Question 25 - 128
------------------------
Question 26 - 169 degrees
Question 27 - 1.485
Question 28 - $11.05
Question 29 - 12.5%
Question 30 - 120 degrees
Question 31 - triangle
Question 32 - 1326 square cm

Question 33 - 990g (CHANGED)