Q&A - P1 Math

[phtthp]

thought only 5 ways, to add up to 6 :-


1\t5
2\t4
3\t3
4\t2
5\t1

you have 7 ways - is it because you’ve included these 2 below ?
0\t6
6\t0

but then test question state "There must be at least a yellow or blue ball", so need to exclude these 2. Hence, 5 ways only.

wah biang ! Now, P1 qn a bit "chim & tricky". They actually test whether children understand English what it mean by "at least a …" ie. "1 or more"

[2010sunflower]

Thanks phtthp but I'm thinking: :oops:


0yellow 6blue – Don’t it meet the “at least a yellow or blue ball” – there is at least a blue ball right?

6yellow 0 blue - Don’t it meet the “at least a yellow or blue ball” – there is at least a yellow right since it say ‘OR’ instead of ‘AND’?

Please enlighten me. :?

May I also ask if the qtn read this way: There must be a yellow or blue ball. Is the answer be 5 ways too?

[catherineleesg]

2010sunflower:

Thanks phtthp but I'm thinking: :oops:


0yellow 6blue – Don’t it meet the “at least a yellow or blue ball” – there is at least a blue ball right?

6yellow 0 blue - Don’t it meet the “at least a yellow or blue ball” – there is at least a yellow right since it say ‘OR’ instead of ‘AND’?

Please enlighten me. :?

May I also ask if the qtn read this way: There must be a yellow or blue ball. Is the answer be 5 ways too?

Hmm.. can we find out?
i think it's 7 too as it says 'or'.

[phtthp]

i kaypoh .. posed your Test qn to Dr. Yeap Ban Har.

below is his reply:-

================================================
Bala has 6 white ping-pong balls.
He has to colour them yellow or blue.
There must be at least a yellow or a blue ball.
How many ways can he do it? (Hint:make a systematic list)


....this is based on Chapter Two - Number Bonds

0+6 and 6+0 are out -
because there must be at least a yellow or blue ball.

answer: -
Total 5 ways:-
1+5, 2+4, 3+3, 4+2, 5+1

[2010sunflower]

Thank phtthp for your help. I felt blessed to have this forum. I am none longer a lone ranger fighting the battle with my DS alone. I have more support now.


I agreed with the answer as I think the ‘number bonds’ helps clear the doubt.

[catherineleesg]

Thanks phtthp.

[phtthp]

Dearest 2010sunflower & catherineleesg, :snuggles:


We are all learning from one another, me too.
glad to have this forum:- as we can continue to uplift one another whenever we face commonly encountered questions not sure how to solve for our kids.

:grphug:

[noahgoh]

wow. love this section… son studies in Rulang. super tough, will pose questions if help needed.

[2010sunflower]

noahgoh:

wow. love this section... son studies in Rulang. super tough, will pose questions if help needed.

The question I posted was Rulang P1 mid year 2012 exam qtn. Their qtns are to kill. Personnally, I felt it will somehow demoralized kids.

[Finkle Binkle]

I agree. When I saw the paper I got a heart attack! Why so hard?