P2 Math - General Discussion

[BigDevil]

Taken from DD’s worksheet…


Study the number pattern and fill in the blanks.
<blank>, 100, 300, 500, <blank>, <blank>

Last 2 is obviously 700 and 900.
What about the first blank?? They are not taught negative numbers yet.

[Muffins]

Hi BigDevil, if they aren’t taught negative numbers yet, then one other patttern i can see is that from 100 to 300, the pattern is x × 2 + 100, and from 300 to 500, the pattern is x × 2 - 100


So, maybe the answer for the first one is x × 2 - 100 = 100

So 2x = 200

Therefore, x = 100

So maybe the pattern is, using my formula:

100, 100, 300, 500, 1100, 2100

[plum-cake]

Muffins:

Hi BigDevil, if they aren't taught negative numbers yet, then one other patttern i can see is that from 100 to 300, the pattern is x × 2 + 100, and from 300 to 500, the pattern is x × 2 - 100


So, maybe the answer for the first one is x × 2 - 100 = 100

So 2x = 200

Therefore, x = 100

So maybe the pattern is, using my formula:

100, 100, 300, 500, 1100, 2100

Hi Muffins

If it is from p1/2 question, then can we teach or give the explenation using x and formulas?

[BigDevil]

I think what Muffins came up with is too complicated for a P2, no?


And they just started learning additions and subtractions of 3 digits numbers…Muffins’ solution went up to 4 digits!

[janet88]

BigDevil:

I think what Muffins came up with is too complicated for a P2, no?


And they just started learning additions and subtractions of 3 digits numbers...Muffins' solution went up to 4 digits!

For P1, the kids are expected to know up to 100, 1000 for P2 and 10,000 for P3.

[Muffins]

plum-cake:

Muffins:

Hi BigDevil, if they aren't taught negative numbers yet, then one other patttern i can see is that from 100 to 300, the pattern is x × 2 + 100, and from 300 to 500, the pattern is x × 2 - 100


So, maybe the answer for the first one is x × 2 - 100 = 100

So 2x = 200

Therefore, x = 100

So maybe the pattern is, using my formula:

100, 100, 300, 500, 1100, 2100

Hi Muffins

If it is from p1/2 question, then can we teach or give the explanation using x and formulas?

That was the only method i could think of at the moment which did not involve negative numbers... so dunno leh :stupid:

[Muffins]

BigDevil:

I think what Muffins came up with is too complicated for a P2, no?


And they just started learning additions and subtractions of 3 digits numbers...Muffins' solution went up to 4 digits!

True that BigD http://www.postimage.org/

[BigDevil]

I emailed DD's Maths teacher about it, and he confirmed that the answer is indeed -100.


He said the question is meant to be an exposure to -ve numbers for the
student, and I should not be overly concerned if DD didn't get it right.

[plum-cake]

Hi Big D

Thanks for letting us know the answer.

[janet88]

Instead of starting another thread for Maths assessment books, maybe we can give each other some tips on useful titles.


*Shaping Maths. Maths Builder. By Agatha Goh (MC)
*Fan Math. i-Excel Heuristic & Model Approach. Li Fanglan