Q&A - P3 Math

[bcmum]

Hi Tianzhu,


I would appreciate if you can advise on the solutions to obtain the answers as i am totally clueless how to solve them.

Thanks.

[Funz]

tianzhu:

cathycho:

Can someone help me with this question?


Mr salam haas 17 cats and birds in total. If he counted 44 legs in all, how many birds are there?

Hi

The numbers are small.P3 kids may use Guess and Check.

You may also use “Make a Supposition”

Assume all were cats, we’ve 17*4 ------ 68

Cat ----- 4 legs
Bird ----- 2 legs

Difference in number of legs between a cat and a bird ------ 2

68 – 44 ----- 24
24/2 ------ 12

12 birds

(5 cats)

For more practice, please visit pg 25-27 of this link.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121&start=240

Best wishes

DD encountered this types of question before. Though she has been shown how to solve them, I have no idea how to explain to her the rationale behind each step. Without understanding, if there should be any variation to this question, she will not be able to solve it. I have been trying to figure out how to explain to her but simply cannot wrap my head around it. So need help here.

Many thanks!!!

[jwxh]

Can someone please help me with this question:

A +B = 120
A - B = 48
Find the value of A.
Thanks

[tianzhu]

bcmum:

Hi Tianzhu,


I would appreciate if you can advise on the solutions to obtain the answers as i am totally clueless how to solve them.

Thanks.

Hi

Where are those questions from?

Those questions appear to be more like puzzles and brain teasers. They are not the types of typical questions found in past years papers.

Best wishes

[tianzhu]

jwxh:

Can someone please help me with this question:

A +B = 120
A - B = 48
Find the value of A.
Thanks

Hi

For P3, a neat way is to use MD.

A - B = 48 ------ This means A is 48 more than B.

Draw a rectangular bar to show A.

Draw another bar, a shorter one, to show B.

Bar A is longer than Bar B by 48.

So, you’ll have
(B + 48) + B ------ 120

B + B ------ 72
B ----- 36

A ----- 48 + 36 -------120

Best wishes

[jwxh]

thanks Tianzhu

[bcmum]

tianzhu:

bcmum:

Hi Tianzhu,


I would appreciate if you can advise on the solutions to obtain the answers as i am totally clueless how to solve them.

Thanks.

Hi

Where are those questions from?

Those questions appear to be more like puzzles and brain teasers. They are not the types of typical questions found in past years papers.

Best wishes

Hi Tianzhu,

The questions are from the enrichment centre that my son attends. It is part of the heuristics questions. Appreciate your advice. Thks.

[tianzhu]

bcmum:

Hi Tianzhu,
The questions are from the enrichment centre that my son attends. It is part of the heuristics questions. Appreciate your advice. Thks.

Hi

Due to time constraints, I’ll be only taking Q1. For the rest of the questions, please check with your child’s enrichment centre.

For P3 kids, some form of drawing might help.

Best wishes

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[buds]

Hi all.


Anyone knows an easier way or a more straightforward method to do these kinds of sums?

Every digit is different.
The sum of the thousands digit and the tens digit is 10.
The sum of all the digits is 16.
The difference btwn the hundreds digit and the ones digit is 6.
The difference btwn the thousands digit and the hundreds digit is 3.
The number is greater than 8000.

It’s a four digit number.

[tianzhu]

buds:

Hi all.


Anyone knows an easier way or a more straightforward method to do these kinds of sums?

Every digit is different.
The sum of the thousands digit and the tens digit is 10.
The sum of all the digits is 16.
The difference btwn the hundreds digit and the ones digit is 6.
The difference btwn the thousands digit and the hundreds digit is 3.
The number is greater than 8000.

It's a four digit number.

Hi

Is this type of question in the syllabus?

It looks more like a brain teaser.

The answer is 9610.

Best wishes