MCQ Answers to the Science Paper Handed out today

Dear all,

Found below are the answers to the MCQ section.
My apologies for being able to make the print larger.

S20 Supplement

Dear all,

Try this question.

Mr Lam has two photocopy machines in his office.

Machine A prints 14 pages more than Machine B in every minute.

Machine A and Machine B together print a total of 552 pages after 3 minutes. How many pages does Machine B print in every minute?

Have fun! :)
Mrs R

S19 Supplement

Dear all,

Try this question.

In a game, Ahmad lost 15 marbles to Benjamin.

Benjamin lost 9 marbles to Charles.

Charles lost 13 marbles to Ahmad.

Each of them has 30 marbles at the end of the game session.

Find the total number of marbles Ahmad and Benjamin had at first. 

Have fun! :)
Mrs R

S18 Supplement

Dear all,

Try this question.

A baker had some eggs. He used 1/7 of them on Monday and 1/11 of the rest on Tuesday. He bought another 153 eggs and then had as many eggs as he had at first. How many eggs did he have at first?

Have fun! :)
Mrs R

S17 Supplement

Dear all,

Try this question.

Ahmad and May saved $800 altogether. 1/4 of Ahmad's savings was $65 more than 1/5 of May's savings. How much more money than May did Ahmad save?

Have fun! :)
Mrs R

Load your own Challenge Questions

Dear all,

If you have a question you would like to share with your friends.
Please do so here.

Have fun! :)
Mrs R

Vita Answer

3a) Milk bottle X
3b) Water is a better conductor of heat than air.

4a) Point A
4b) 20min - 5min = 15 min
4c) A passenger/ Jane had just sat on the seat (0.5m), heat is gained by the seat from his/her body (0.5m) causing the seat to gain more heat and the temperature rises at point C. (1m)

5a) Possible ans: A and D/ A and C/ B and D/ C and D
5b) D , B

6a) (The question is about Carly so the answer should be specific to Carly) 
      Carly was losing heat quickly to the environment.
6b) The air in the room gained more heat (1m) as heat from more heat was loss by the increased number of people in the room.

7a) Styrofoam
7b) Styrofoam is a poor conductor of heat (1m) so the heat loss from the noodles to the surrounding air was reduced. (1m)
7c) There is an increased exposed surface area (0.5m) to allow more heat loss (0.5m) from the noodles to the surrounding air. 
7d) Noodles: heat loss; Chopsticks: heat gain 

Hope this help :)
Mrs R

Vita ans

Dear all,

I am having trouble with my Internet connections. 

I will try to type the answers from my Ipad.

I will provide the answers tomorrow if I cannot get it across today.

Do not spent too much time online, please revise :)

Mrs R 

Extra Supplementary Class on Friday

Dear all,

Please note that this coming Friday, 19 October 2012, from there will be an extra-supplementary class from 1.30pm to 3.30pm. This is in place of the classes that we have missed due to holidays and examinations.

Thank you.
Mrs R

SA2 Practice 2 Answer Key

Dear all,

Found below is the answer key for SA2 Practice 2.

Please use the above answer key to check your corrections and help you to understand your working or provide alternative working to help you answer your questions better.

Thank you.
Mrs R

SA2 Practice 1 Answer Key

Dear all,

Found below is the answer key for SA2 Practice 1.

Please use the above answer key to check your corrections and help you to understand your working or provide alternative working to help you answer your questions better.

Thank you.
Mrs R

S16 Supplement

Solve this question.

Fred has $60 and George has $40 in their bank account. Everyday, Fred deposits $5 while George deposits $9.

(a)    How long does it take for Fred and George to have the same amount of money in their account?

(b)    How many days will George need to save in order to have $40 more than Fred?

 

Discuss with your friend how you have derived your answers.

Have fun!

Mrs R

S15 Supplememnt

Solve this question.

Mrs Gopal had some $2, $5 and $10 notes in her purse.  The number of $5 notes was 1/3 the number of $2 notes.  The number of $10 notes was 1/2 the number of $2 notes. After spending all her $10 notes and 2/3 of her $2 notes, she had $210 left in her purse. How much money did she spend altogether?

Discuss with your friends.
Have fun!
Mrs R

S14 supplement

Dear all,

Please try to solve this question. Remember to try it for at least 2 days before you reveal your answers here. Remember to give others a chance to spend some time to solve it. :)
There are some spiders and ants in a container.
20% of the total number of creatures are spiders.
Tom counted a total of 192 legs.
How many spiders and ants are there altogether?

Have fun,
Mrs R

S13 Supplement

Dear all,

Please try to solve this question. Remember to try it for at least 2 days before you reveal your answers here. Remember to give others a chance to spend some time to solve it. :)

May and Dawn each brought some sweets to the class.
Each of them took out the same number of sweets to distribute to their classmates.
If May took out 1/4 of her sweets and gave each of her classmates 6 sweets,
she would have 14 sweets left over.
If dawn took out 1/2 of her sweets and gave each of her classmates 8 sweets,
she would be short of 10 sweets.
How many sweets did each girl have at first?

Have fun,
Mrs R

S12 Maths Supplement

Draw A Model – Add/Subtract The Same (Difference remains the same)

 

At first, Shop A had 156 kg of rice and Shop B had 72 kg of rice.

After  each shop sold the same quantity of rice, the amount of rice that Shop A
had left was 4 times that of Shop B. How many kilograms of rice did Shop A sell?

Solve this, discuss your answer and method. Create one for your friends if you like. :)
Have fun :)
Mrs R

S11 Maths Supplement

Draw a model - comparison


Sheila and Muthu have 80 marbles altogether.
Sheila and Alice have 50 marbles altogether.
Muthu has 4 times as many marbles than Alice.
How many marbles does Sheila have?

Solve this, discuss your answer and method. Create one for your friends if you like. :)
Have fun :)
Mrs R

Mini Decimals Supplement 2

Try these ... I know you can do them :)

Section A ( 20 x 2 marks )

Choose the correct answer for each of the following questions. Write your answer in the brackets provided.

1.         What is the answer when 5.295 is rounded off to 2 decimal places?

(1)       5.20                                                    (2)       5.29

(3)       5.30                                                    (4)       5.39                           

2.         Find the product of 12.3 and 3. What is the value of the digit ‘3’ in the product?

            (1)       0.30                                                    (2)       3.00

 (3)       30.0                                                    (4)       300                                        

3.        Jean has 25 m of ribbon. Linda has 6  m of ribbon. How many metres of ribbon do they have altogether? Express your answer as a decimal.

           (1)       31.01                                                  (2)       31.14

(3)       31.25                                                  (4)       31.75                         

4.         Mr Lim sold 9 vases. Each vase cost $52.50. He distributed his earnings among his 5 children equally. How much does each child receive?

           (1)       $10.50                                                (2)       $94.50

(3)       $262.50                                              (4)       $472.50                     

5.         Subtract 3.92 from the sum of 14.7 and 8.03.

            Round off your answer to 1 decimal place.

           (1)       10.8                                                    (2)       18.8

(3)       22.7                                                    (4)       26.7                           

6.         Find the value of 6.59 x 9.

(1)       6.68                                                    (2)       15.69

(3)       54.51                                                  (4)       59.31                         

7.         The sum of two decimals is 417. If one of them is 4 times the other, what is the

smaller number?

(1)       83.4                                                    (2)       104.25

(3)       250.2                                                  (4)       413.5                         

8.         How many 0.25 are there in 2 ?

(1)       22                                                        (2)       11

(3)       3                                                          (4)       8                                 

Section B ( 20 x 2 marks )

Work out each question and write your answers in the boxes provided.

All working must be shown and give your answers in the units provided.

1.        A box of chocolate costs $8, correct to the nearest dollar. What is the lowest possible price of the box of chocolate?

             

                                                                                                Answer: ______________

2.        Arrange the following in descending order.

            ,                0.63,              0.097,                    

                                                            Answer: _______, _______, _______, _______ .

3.        The product of 11.37 and 6 is ______________.

                                                                                                Answer: ______________

4.        Mark bought 6 goldfish. Each goldfish cost $2.50. Mark gave the cashier two $10 notes. How much change did he receive?

                                                                                    Answer: _______________

5.        Sarah bought 5 pies at $0.50 each. She also bought 3 similar cakes. She spent a total of $10.30. How much did she pay for a piece of cake?

                                                                                                Answer: _______________

6.         The mass of Shelia is 35.3 kg. She is 1.9 kg lighter than Jane. Dorothy is 4.3 kg lighter than Jane. Find the total mass of the 3 girls.

                                                                                                Answer: _______________ kg

7.         Arrange these numbers in descending order.

                        3.25,  3  , 3.05,  3  

                                                            Answer: _______, _______, _______, _______.

8.         If you add 0.1 to a number and round it off to the nearest whole number, the answer is 55. If you add 0.2 to the number and round it off to the nearest whole number, the answer is 56. What is the number?

                                                                                                Answer: _______________

9.      Pack A contains 5 times as much salt as Packet B. Monica adds 0.3 kg of salt to Packet A and 3.5 kg of salt to Packet B. The amount of salt in the two packets is now the same. What was the mass of salt in Packet B at first? Give your answer in kilograms

                                                                                                Answer: _______________ kg

Have fun :)
Mrs R

S10 Maths Supplements

S9 Maths Supplements

Jack has a total of 20 fifty-cent coins and twenty-cent coins.
He has $5.20 altogether. How many twenty-cent coins does he have?

2 students Lynn and Mala presented their working as shown:

Lynn's working:

50 X 20 = $10.00

$10.00 - $5.20 = $4.80

50 ₵ - 20 ₵ = 30 ₵ 

$4.80 ÷ 30 = 16       

Jack has 16 twenty-cent coins.

Mala's working:

Assume all the coins are twenty cent coins.

Therefore,

50 X 20 = 1000 cents

1000 - 520 = 480 extra cents

50 - 20 = 30 cents

480 ÷ 30 = 16 fifty-cent coins

Jack has 16 twenty-cent coins

Whose answer is the best and most logical? Explain your answer. :)

Have fun!

Mrs R

                

Wishes for Miss Chow

Dear All,

Please pen your wishes for Miss Chow. We are sadden to have to see her leave us again. However, we know it is for good reasons so let us pen her some good wishes until she returns to us in 2 years' time. :)

Once you have written I will invite her to come to our blog to take a look :)

Have fun :)
Mrs R

National Day Housekeeping

For collage...

What to bring??

pictures that shows Singapore culture

Food
Clothings
places of interest -> Geylang Serai/Chinatown/Little India/MBS/The Durian/Garden by the bay/Sentosa/USS/
National flower -> Orchids
Merlion
Singapore Flags
Momentos of things you love about Singapore

Thank you for all your contributions :)

Remember to wear red T-shirts. Please also be reminded that the canteen vendors are not operating tomorrow, do being light snacks. A healthy sandwich is a good snack. :)

Thank you, see you tomorrow.
Mrs R 

Reminder for Sit-up and SBJ tests

Dear all,

Please be reminded that some of us will be sitting for these tests tomorrow. We believe in you, you can do it, never give up! :)

8) Mrs R

For S7 Maths Challenges

I am heartened to see all of you trying so enthusiastically to solve the problem. Do remember to show your STAR values at all time :)

In a school hall, chairs were arranged in rows such that there were exactly 9 chairs in each row. For a concert, Mr Ong brought 6 more chairs into the school hall and rearranged all the chairs. There are now exactly 7 chairs in each row and 12 more rows than before. 

How many chairs are there in the school hall for the concert? 

Think through in simple English ... Break it down one sentence at a time. 

In a school hall, chairs are arranged in rows such that there were exactly 9 chairs in each row. 

In simple English ... there were rows of chairs, how many chairs in each row?

For a concert, Mr Ong brought 6 more chairs into the school hall and rearranged the chairs. 

Think through ... the room already has _____ X 9 = ______ chairs and now

Mr Ong added 6 more chairs

AND REMEMBER, HE REARRANGED the hall again.

There are NOW (new arrangement) 7 chairs in each row 

and 12 more rows than before.

Can we use any of these information to come up with any number statements?

Dear all, think through do not give up so easily :) 

Always take one step at a time :) 

Nothing is Impossible if You TRY! 

Mrs R 

S9 More Maths Supplements

Maths supplements new challenges :)

Try me ... I know you can do it :)

There are 4 rows of chairs with 6 chairs in each row. Miss Li wants to rearrange all the chairs to form a square. She wants the same number of chairs on each side of the square. How many chairs must she put on each side of the square? 

Think through which method would be the most efficient method to solve this question. Comment on it and if you like you may set parallel questions for your friends to solve. Have fun :) 

Mrs R

S8 Maths Supplements

Maths supplements new challenges :)

Try me ... I know you can do it :)

Evan wanted to put some apples into boxes. If he puts 10 apples into each box, he would have 5 apples left over. If he puts 12 apples into each box, he would be short of 5 apples. How many apples did Evan have? 

Think through which method would we use to solve this question. Comment on it and if you like you may set parallel questions for your friends to solve. Have fun :) 

Mrs R

Mini Brain Supplements for Decimals

Dear all,

Try this out and write your answers in a foolscap paper :)
Remember save the trees do not waste too much paper.

1.         In 28.47, the digit ‘7’ has the value of _______________.

            (1)       70                                                 (2)       7

 (3)       0.7                                                (4)       0.07                          

2.         In 125.436, which digit is in the tenth place?

            (1)       5                                                   (2)       2

 (3)       3                                                   (4)       4                                 

3.         Which one of the following has the least value?

            (1)       5.749                                                  (2)       5.497

(3)       5.794                                                  (4)       5.479                          (          )

4.         4 hundreds, 5 tenths and 6 thousandths is ______________.

            (1)       450.006                                     (2)       400.650

(3)       400.506                                      (4)       400.056                       

5.         Tom weighs 23.3 kg. Susan is 0.09 kg lighter than Tom.

            What is Susan’s weight? 

           

           (1)       22.30                                                  (2)       23.11

(3)       23.29                                                  (4)       24.10                          (          )   

6.         72 tenths is equal to _______________.

            (1)       0.072                                                  (2)       0.72

(3)       7.2                                                       (4)       72                                (          )           

7.         Sarah spent $87.60.

            She spent $5.70 less than Darren.

            How much did they spend altogether?

            (1)       $81.90                                                (2)       $93.30

(3)       $169.50                                              (4)       $180.90                      (          )

8.       Lionel bought a soft toy at $28.90. He paid the cashier $50.

How much change did he receive from the cashier?

(1)       $21.10                                         (2)       $21.90

(3)       $22.10                                        (4)       $22.90                        (          )

Section B ( 20 x 2 marks )

Work out each question and write your answers in the boxes provided.

All working must be shown and give your answers in the units provided.

1.         What is the sum of 12 tenths and 7 hundredths?

                                                                                                 

2.         Mark ran 3.1 km on Monday. On Tuesday, he ran 0.5 km more than the distance he ran on Monday. What was the total distance he ran on these two days?

                                                                                                 

3.         Express 0.18 as a fraction in its simplest form.

                                                                                                Answer: _______________

4.         What is the sum of 2.34 and 9.9?

                                                                                                Answer: _______________

5.         Mrs Raju bought 3.41 kg of meat. She bought 2.12 kg of vegetables. How much more meat did she buy than vegetables?

           

                                                                                                Answer: _______________ kg

6.         Write 6 ones, 33 tenths and 7 thousandths in numerals.

                                                                                                Answer: _______________

7.         The difference in value between the digit 6 in 0.625 and 20.436 is __________.

Answer: _______________

8.         Mrs Muthu bought 42 kg of oranges. She used 15.92kg of oranges to make fruit juice. How many kilograms of oranges had she left? Round off the answer to one decimal place.

Answer: _______________ kg

9.         ♥ + ♥ + ☺ = 3.5

♥ + ☺ = 2.3

☺ = ?

Answer: ☺ =_______________

10.       Arrange the following decimals. Begin with the greatest.

            0.025, 0.25, 0.225

                                                                                                Answer: _______________