Q&A - P3 Math

[acforfamily]

owlparents:

Hi,


I have this Maths problem from Pei Chun P3 SA2 2008. Pls help. Thanks.

Grandpa has some stamps. If he gives 6 stamps to each of his grandchildren, he will have 5 stamps left over. If he gives 8 stamps to each of his grandchildren, he will be hsort of 9 stamps.

a) How many grandchildren does Grandpa have?

b) How many stamps does Grandpa have?

Another way to look at this solution is looking at the difference between the 2 ways.

For each child, the difference in the 2 ways is (8-6) i.e. 2 stamps.
In total, the difference in the 2 ways is (9+5) i.e. 14 stamps
Therefore, the number of children to have a difference of 14 stamps is (14 / 2) i.e. 7 children.

Hope this helps.

[Tang]

shurley197323:

Thks for the answer. But still trying vey hard to explain.

Split 338 into 2 portions - 1 Big and 1 Small, with the Big more than the Small by 82.

So the find the Big,
338 + 82 = 420
420 / 2 = 210 bookmarks

[peterch]

[Moderator's note: Topics merged.]


Hi friends,

I would like to share with you as I am doing ,math exercise for my boy from previous year exam paper.
We come to 1 question which I think it should be a wrong/incomplete question.

Q: Ramu saw 26 sheep and chickens in a farm. He counted a total of 76 legs. How many sheep were there?

I would appreciate your time and thought for this.

Regards...

[schellen]

What level is this question for? It seems to me that algebra is a good way to solve it but I think you’d better wait for someone with more experience.

[peterch]

schellen:

What level is this question for? It seems to me that algebra is a good way to solve it but I think you'd better wait for someone with more experience.

Sorry, it was for primary 4.

[kingboo]

peterch:

schellen:

What level is this question for? It seems to me that algebra is a good way to solve it but I think you'd better wait for someone with more experience.

Sorry, it was for primary 4.

The answer is 12 sheep and 14 chickens. 12x4=48( 4 legs per sheep) and 14x2=28 (2 legs per chicken).

[tianzhu]

Hi


For this P4 question, a student may use Guess and Check to solve it as the figures are quite small.Another way is making a supposition or assuming method which is more efficient for questions involving bigger numbers.

Hope this helps.

http://farm3.static.flickr.com/2510/3866423107_c6a0729996_o.jpg\">

[acforfamily]

peterch:

Q: Ramu saw 26 sheep and chickens in a farm. He counted a total of 76 legs. How many sheep were there?

I agree with Tianzhu's assumption method i.e. assume all are chicken first ( alternatively sheep first). This is the method recommended for that level.

[peterch]

acforfamily:

peterch:

Q: Ramu saw 26 sheep and chickens in a farm. He counted a total of 76 legs. How many sheep were there?

I agree with Tianzhu's assumption method i.e. assume all are chicken first ( alternatively sheep first). This is the method recommended for that level.

Wow...thanks for the helps friends....regards

[Tang]

EN:

Hi Tang


I like your solution on qs 1. It's short and simple and the diagram helps.
I would like to try teaching my kids using your method but I'm a bit lost as to how to explain on certain portion.

I understand the top part but stuck in the following:

2 u --> 89 - 65 = 24

I understand where the 2u come from but how to explain why

89-65 =

TIA

The difference is 2 u.
And the difference between the 2 models is 89 - 65.