Q&A - P3 Math

[Muffins]

Hi Dharma.


Sorry to be a buzzkill, but the actual question was 21 cm, not 210 cm…

[Dharma]

Muffins:

Hi Dharma.


Sorry to be a buzzkill, but the actual question was 21 cm, not 210 cm....

Hi Muffins,

To climb 21cm

N x (N + 1) / 2 = 21

N x (N + 1) = 42
6 x 7 = 42
N = 6 days

By using 210cm I was trying to show that it will be easier to solve the problem by finding a pattern. The listing method will
be just too long.

[imacsg]

Can you help to explain why is it wrong.


I am a 3 digit number.
My hundreds and tens digit are the same.
My ones digit is 4 more than my tens digit.
What number can I be?

My son writes 448, but the teacher marked it wrong and said the correct ans is 559. I thought the ans can be either 559, 448, 337, 226 or 115

Thanks

[singmathstutor]

imacsg:

Can you help to explain why is it wrong.


I am a 3 digit number.
My hundreds and tens digit are the same.
My ones digit is 4 more than my tens digit.
What number can I be?

My son writes 448, but the teacher marked it wrong and said the correct ans is 559. I thought the ans can be either 559, 448, 337, 226 or 115

Thanks

Based on the question that you have written, there are a few possible solutions as you have mentioned. Your son's answer is correct.

P.S. Can mod please transfer this post to the correct thread if needed. Thanks

[imacsg]

Hi All,

Thanks for the prompt reply. It is P3 question. I will check with the Teacher why he insists 559 the correct answer.

[markfch]

imacsg:

Hi All,

Thanks for the prompt reply. It is P3 question. I will check with the Teacher why he insists 559 the correct answer.

I've seen similar P3 math qn before. I suspect that there's a part of the information that is missing. Cos usually qn will limit to only one correct ans.

[singmathstutor]

markfch:

imacsg:

Hi All,

Thanks for the prompt reply. It is P3 question. I will check with the Teacher why he insists 559 the correct answer.

I've seen similar P3 math qn before. I suspect that there's a part of the information that is missing. Cos usually qn will limit to only one correct ans.

Problem-solving questions can be open-ended. For P3 standard, I think this question is reasonable.

[biniv300]

:stupid: :stupid:

[biniv300]

singmathstutor:

markfch:

[quote=\"imacsg\"]Hi All,

Thanks for the prompt reply. It is P3 question. I will check with the Teacher why he insists 559 the correct answer.

I've seen similar P3 math qn before. I suspect that there's a part of the information that is missing. Cos usually qn will limit to only one correct ans.

Problem-solving questions can be open-ended. For P3 standard, I think this question is reasonable.[/quote]ask maths guru!

[matrix0405]

Kindly recommand me a good assessment book for Pri 3 English, Maths, Chinese and Science. For average calibre student. Kindly provide exact title & publisher so that i can find the right books.