Q&A - PSLE Math

[Belle2011]

Another question:

7 [] (7 [] 7) [] 7 = 5.

Fill in the [] with the 4 operators : +, -, *, / and each can be used more than once.

Thank-you.

[tianzhu]

Vanilla Cake:

htn:

Hi, anyone tried Pei Chun 2011 prelim paper (paper 2) question 14, can teach me how to solve ?

http://i56.tinypic.com/2qx19tz.png\">

Pls wait for Uncle tianzhu/MathIzzzFun/atutor2001 to provide the worked solutions.

Answer given
14 (a): 69.68 cm
14 (b): 109.92 cm2

Hi

A quick one, so sorry no time to draw today.

I'll provide some pointers.

Radius of quarter circle (AD) ----- 12

Diameter of small semi circle (AD or BC) ------ 12

Length AB of rectangle (AB) -------- 28

Perimeter of shaded area ------ (3.14*12) + 16 + 16 ------ 69.68

Area of shaded part ------ (28*12) – (3.14*12)/2 ------- 336 – 226.08 ------109.92

Best wishes

[MathIzzzFun]

Belle2011:

Another question:

7 [] (7 [] 7) [] 7 = 5.

Fill in the [] with the 4 operators : +, -, *, / and each can be used more than once.

Thank-you.

Hi

7 - (7+7) / 7 = 5

cheers.

[MathIzzzFun]

Vanilla Cake:

htn:

Hi, anyone tried Pei Chun 2011 prelim paper (paper 2) question 14, can teach me how to solve ?

http://i56.tinypic.com/2qx19tz.png\">

Pls wait for Uncle tianzhu/MathIzzzFun/atutor2001 to provide the worked solutions.

Answer given
14 (a): 69.68 cm
14 (b): 109.92 cm2

hi

http://i53.tinypic.com/t54t54.jpg\">

cheers.

[Tang]

Belle2011:

Another question:

7 [] (7 [] 7) [] 7 = 5.

Fill in the [] with the 4 operators : +, -, *, / and each can be used more than once.

Thank-you.

Hi,

How are 7 and 5 related?

7 ---> 5

We need to minus 2 from 7.

7 - 2 = 5

.......

[vlim]

HiLenny08,

Below is Rosyth maths paper answers.
Paper 1
1. (3) 2. (4) 3. (3) 4. (1) 5. (4) 6. (2) 7. (3) 8. (4)

9. (1) 10. (2) 11. (2) 12. (2) 13. (2) 14. (1) 15. (1)

16. (1,3,9) 17. (2.83) 18. (0.09, 3/11,0.3,3/8) 19. (264)

20. (South-west) 21.(20) 22.(0740) 23. (9:20)

24. 5th col and 3rd roll box.

26. (thursday) 27. (50) 28.(96+4y) 29.(9.5pie +6)

30. (12)

paper 2

1. (8) 2.(41.58) 3.(46) 4.(160) 5. (16 2/3 %) 6. (267)

7. (550) 8. (27pie +38) 9a. (tue and fri) 9b. thur 9c. 174

10. (19 degree) 11. (35 :51) 12. (450) 13a.(1048)

13b. (61) 14.(40.4%) 15a. (15cm) 15b. (8.25am)

16.(273) 17a. (83.78cm) 17b. (209.44 cm2)

18(9.15 am)

[Brenda10]

vlim:

HiLenny08,

Below is Rosyth maths paper answers.
Paper 1
1. (3) 2. (4) 3. (3) 4. (1) 5. (4) 6. (2) 7. (3) 8. (4)

9. (1) 10. (2) 11. (2) 12. (2) 13. (2) 14. (1) 15. (1)

16. (1,3,9) 17. (2.83) 18. (0.09, 3/11,0.3,3/8) 19. (264)

20. (South-west) 21.(20) 22.(0740) 23. (9:20)

24. 5th col and 3rd roll box.

26. (thursday) 27. (50) 28.(96+4y) 29.(9.5pie +6)

30. (12)

paper 2

1. (8) 2.(41.58) 3.(46) 4.(160) 5. (16 2/3 %) 6. (267)

7. (550) 8. (27pie +38) 9a. (tue and fri) 9b. thur 9c. 174

10. (19 degree) 11. (35 :51) 12. (450) 13a.(1048)

13b. (61) 14.(40.4%) 15a. (15cm) 15b. (8.25am)

16.(273) 17a. (83.78cm) 17b. (209.44 cm2)

18(9.15 am)

Thank you Vlim for sharing the answer key! :hugs:

We had tried the Q13 yesterday and will proceed to try the rest!

[vlim]

u are welcome brenda10…

[Heeheehaha]

Please help in the following Question, TIA

1.Aimei, Bala & Carl won some money in a lucky draw. The amount of money won by Aimei, Bala & Carl wasi n the ratio 8: 5 : 4. They saved some of the money & spent the rest. Aimei saved $480, Bala saved $540 & Carl saved $120. The amount of money spent by AImei, Bal & Carl was in ratio 8:3:5
(a) Find the ratio of the amount of money saved by Aimei to Bala to Carl. Give your answer in its simplest form
(b) How much money did Aimei win ?
2. 6A & 6B had an equal number of pupils. 6A had twice as many boys as 6B but 6B had 3 times as many girls as 6A.
(a) Find the ratio of the number boys in 6A to the number of girls in 6B( Give your answer in its simplest form)
(b) If there are 36 girls in 6B, how many more boys are there in 6A than 6B ?

[Lenny08]

Thanks alot , Vlim, for sharing.


Best Regards,
Lenny