Q&A - P3 Math

[Florence88]

Apology, whether question should be :


…40% of the new total were marbles…
[/b]

[Florence88]

Apology, whether question should be :


…40% of the new total were marbles…
[/b]

[annloww]

HI All

Need help to solve the following problem

which one of the folloswing no, when added to 3178 will allow regrouping of the ones and hundreds ?

1) 6732
2) 6597
3) 5914
4) 5832

Thank you so much :celebrate: :celebrate:

[concernParent777]

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions

http://postimage.org/image/2qtipkcjo/

http://postimage.org/image/2qtpbpqis/

[concernParent777]

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions
http://postimage.org/image/2qv68wubo/

http://postimage.org/image/2qvq3d090/

[iFruit]

concernParent777:

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions
http://postimage.org/image/2qv68wubo/

http://postimage.org/image/2qvq3d090/

How about branching method?

[24hr-mum]

annloww:

HI All

Need help to solve the following problem

which one of the folloswing no, when added to 3178 will allow regrouping of the ones and hundreds ?

1) 6732
2) 6597
3) 5914
4) 5832

Thank you so much :celebrate: :celebrate:

regrouping means the addition of 2 digits must be more than 10
all the ones in the 4 choices allowing regrouping
now, for option 1, the hundreds digit ie 7 and 1 when adding 6732 and 3178, doesnt allow for regrouping as 7+1+the ten carried forward when adding the tens in the two numbers, is only 9.

if u work thru, the answer shd be no. 3 i think (ie regrouping only ones and hundreds), as for no. 4 must regroup the tens as well as ones and hundreds

[24hr-mum]

iFruit:

concernParent777:

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions
http://postimage.org/image/2qv68wubo/

http://postimage.org/image/2qvq3d090/

How about branching method?

just curious, whch sch is this paper from? my child not yet p4, so i m amazed at that kind of question difficulty.
duno abt lcm, but if using logic, wld be like this:
first stop: 5
2nd stop: 5-3 (cant +5 as that will be 10)

so, 5-3+5-3+5-3+5=11
7 stops. not sure if correct

[tianzhu]

Hi concernParent777


LCM is covered in secondary one.

For P4, a student may use a heuristics called ‘Making a systematic list” to get the answer for Q1.Make a tabulated list and you should be able to get the answer.

Or, use logical reasoning

11= 5+6 = 5+2+2+2

Every interval of two stops will increase the number of passengers by 2, so you’ll have 3 intervals making a total of 6 stops. Add 6 to 1. You’ll have 7 stops.

Another way to look at it.

11 = 5 + 6
6 = 15 – 9, therefore you’ll have 3 stops where 5 passengers are picked up and 3 stops where 3 passengers are let off. Add 6 to 1. You’ll have 7 stops.

I believe you’ll be able to solve Q2 now.

Best wishes

[24hr-mum]

tianzhu:

Hi concernParent777


LCM is covered in secondary one.

For P4, a student may use a heuristics called ‘Making a systematic list” to get the answer for Q1.Make a tabulated list and you should be able to get the answer.

Or, use logical reasoning

11= 5+6 = 5+2+2+2

Every interval of two stops will increase the number of passengers by 2, so you’ll have 3 intervals making a total of 6 stops. Add 6 to 1. You’ll have 7 stops.

Another way to look at it.

11 = 5 + 6
6 = 15 – 9, therefore you’ll have 3 stops where 5 passengers are picked up and 3 stops where 3 passengers are let off. Add 6 to 1. You’ll have 7 stops.

I believe you'll be able to solve Q2 now.

Best wishes

hi tianzhu,
u r really a math genius.
do u know of any assessment bk on heuristics besides andrew er's?