Q&A - PSLE Math

[dazzlego]

vivopenguin:

I am a Primary 5 but I do not know about algebra. I have a question and I hope you can solve it and explain how to do it.

Simply 8y-6y/2+3.

Hi vivopenguin,

I think u have implicitly learned algebra before.
U can assume the y in the algebra here as a unit
8units - 6 units / 2 + 3
Can you do this? Of course you can!

Applying the order of operation, do the division first
8 units - 3 units + 3 = 5 units + 3

In algebra,
8y - 3y + 3 = 5y + 3

Isn't it the same?

So the answer for the question given is 5y+3

Hope it helps :celebrate:

[jonaandr]

Please help to solve this problem sum, thanks!


Jim bought some chocolates and gave half of it to Ken. Ken bought some sweets and gave half of it to Jim. Jim ate 12 sweets and Ken ate 18 chocolates. The ratio of Jim’s sweets to chocolates became 1:7 and the ratio of Ken’s sweets to chocolates became 1:4. How many sweets did Ken buy?

[MathIzzzFun]

jonaandr:

Please help to solve this problem sum, thanks!


Jim bought some chocolates and gave half of it to Ken. Ken bought some sweets and gave half of it to Jim. Jim ate 12 sweets and Ken ate 18 chocolates. The ratio of Jim's sweets to chocolates became 1:7 and the ratio of Ken's sweets to chocolates became 1:4. How many sweets did Ken buy?

this was discussed before and there are various ways to solve - using model, Units/Parts, algebra... you can search for the solutions using keywords eg. \"Jim bought some chocolates\"

http://i49.tinypic.com/esqept.png\">

cheers.

[Verysuperkiasu]

I have a question abt speed.


If the question states the motorist moving from one point to another at a certain speed, then rest for sometime, for example 40min. Then he continue journey for 2nd half.

If the question asks the average speed for 2nd half, do we take into account the 40 min? What if the question asks for the average speed for entire journey , then do we take time taken as inclusive of the 40min rest time?

[elkniwt]

Verysuperkiasu:

I have a question abt speed.


If the question states the motorist moving from one point to another at a certain speed, then rest for sometime, for example 40min. Then he continue journey for 2nd half.

If the question asks the average speed for 2nd half, do we take into account the 40 min? What if the question asks for the average speed for entire journey , then do we take time taken as inclusive of the 40min rest time?

average speed for 2nd half -> don't include 40min rest time
average speed for entire journey -> have to include 40min rest time

[charsen]

Verysuperkiasu:

I have a question abt speed.


If the question states the motorist moving from one point to another at a certain speed, then rest for sometime, for example 40min. Then he continue journey for 2nd half.

If the question asks the average speed for 2nd half, do we take into account the 40 min? What if the question asks for the average speed for entire journey , then do we take time taken as inclusive of the 40min rest time?

Hi
If the question says that the resting time is 40 min,then you should not take that into account as the time taken to travel the second half is the time taken to drive the second half.
Charsen

[isetan]

Hi Tianzhu, MathIzzzfun,


This forum is rather quiet during this period of time. A lot postings are on other psle posting results.

My gal got As for her maths in this psle exam. I would like to sincerely thank you all for your help during the preparation for her PSLE recently. There are hundreds if not thousands of questions posted by students and you have tirelessly provide solutions to students who need help.

I would rather post here to say thank you as I think you will be likely see it over here. A big thank you to you. Cheers!

[CaptainSparklez]

Hello guys,I just finished my PSLE.Just to give you guys a rough gauge about PSLE maths.PSLE maths actually isn’t all that difficult.So parents,you do not need to worry

so much.PSLE maths is actually a basic maths with twists.Just take note of key points and check and check again.You may never know.1 point can make a big difference.

[pixiedust]

isetan:

Hi Tianzhu, MathIzzzfun,


This forum is rather quiet during this period of time. A lot postings are on other psle posting results.

My gal got As for her maths in this psle exam. I would like to sincerely thank you all for your help during the preparation for her PSLE recently. There are hundreds if not thousands of questions posted by students and you have tirelessly provide solutions to students who need help.

I would rather post here to say thank you as I think you will be likely see it over here. A big thank you to you. Cheers!

Hi Tianzhu, MathIzzzfun,

I would also like to express my sincere THANKS to both of you for helping out with the numerous Maths questions, many which are from the school mock papers. My ds also did well for Maths this PSLE exam. I am very very grateful for your help !

[linden2000]

pixiedust:

Hi Tianzhu, MathIzzzfun,

I would also like to express my sincere THANKS to both of you for helping out with the numerous Maths questions, many which are from the school mock papers. My ds also did well for Maths this PSLE exam. I am very very grateful for your help ![/b]

Hi Tianzhu, MathIzzzfun,

Would also like to thank both of you for tirelessly helping to solve questions here. My DS did well for Maths in his PSLE. Though I've never posted questions here, I have spent quite a few nights poring over your solutions. Many thanks once again.