P2 Math - General Discussion

[teh_oh]

plum-cake:

How do you teach this type of Questions


The sum of two numbers is 25.
The difference between the two numbers is 5.
The two numbers are _____ and ____.

Draw models:-
A[------------------------]) 25
B[------------]<__5__> )

B--> (25-5)/2=10
A-->10+5=15

[teh_oh]

plum-cake:

Star + 106 = 200
moon+ moon = 18
Star + moon = _____


The missing number is _______

1 moon = 18/2 = 9
1 star = 200-106 = 94
star + moon = 94+9 = 103


how to find 1 moon is straight forward.
how to find 1 star, i told my child to visualise the 'Star + 106 = 200' into a weighing scale. To find 'Star', he has to take the equivalent of '106' out of the '200' to balance the 'scale'.

[plum-cake]

teh_oh:

plum-cake:

Star + 106 = 200
moon+ moon = 18
Star + moon = _____


The missing number is _______

1 moon = 18/2 = 9
1 star = 200-106 = 94
star + moon = 94+9 = 103


how to find 1 moon is straight forward.
how to find 1 star, i told my child to visualise the 'Star + 106 = 200' into a weighing scale. To find 'Star', he has to take the equivalent of '106' out of the '200' to balance the 'scale'.

Thank you so much...
Thk you for the scale idea.

[teh_oh]

plum-cake:

teh_oh:

[quote=\"plum-cake\"]

Star + 106 = 200
moon+ moon = 18
Star + moon = _____


The missing number is _______

1 moon = 18/2 = 9
1 star = 200-106 = 94
star + moon = 94+9 = 103


how to find 1 moon is straight forward.
how to find 1 star, i told my child to visualise the 'Star + 106 = 200' into a weighing scale. To find 'Star', he has to take the equivalent of '106' out of the '200' to balance the 'scale'.

Thank you so much...
Thk you for the scale idea.[/quote]You are welcome. I learned alot from other parents over at the P3/P4 thread as well.

[janet88]

I am completely at a loss where upper pri math is concerned. Math at p5 is beyond my level of understanding. I just bought the fan math at the recommendation of a kind mummy. This heuristics thing can be tested in section A.

Hubby told me daughter at p1 was taught to calculate number of legs of ducks and cows :!: Am still ok with science but need to read up.

[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.