P2 Math - General Discussion

[verykiasu2010]

cookie:

this is from a P1 assessment book. although the answer is given, but i dont know how to teach my DS how to do the workings/solve it. anyone can advise? tks.


A + A + A + B = 40

A + A + B = 28

what is A and what is B?

40 - 28 = 12

3A - 2A = A

B - B = zero

hence A = 12

3 A = 36

Hence B = 4

[caroline3sg]

Trial & Error method.


At first, try 10 for A, 8 for B. It doesn’t meet A + A + A + B = 40 (answer only 38, so must increase value of A and decrease value of B).

Then try 12 for A, 4 for B. You can get total 40.

[corneyAmber]

cookie:

this is from a P1 assessment book. although the answer is given, but i dont know how to teach my DS how to do the workings/solve it. anyone can advise? tks.


A + A + A + B = 40

A + A + B = 28

what is A and what is B?

A + (A + A+ + B) = 40
A + 28 = 40
A = 40 -28 = 12
B = 28 - 12 - 12 = 4

This is the \"see the pattern\" method.

[cookie]

caroline3sg:

Trial & Error method.


At first, try 10 for A, 8 for B. It doesn't meet A + A + A + B = 40 (answer only 38, so must increase value of A and decrease value of B).

Then try 12 for A, 4 for B. You can get total 40.

did the trial & error method, just that not sure is this the way to teach P1. thanks !

[cookie]

verykiasu2010:

cookie:

this is from a P1 assessment book. although the answer is given, but i dont know how to teach my DS how to do the workings/solve it. anyone can advise? tks.


A + A + A + B = 40

A + A + B = 28

what is A and what is B?

40 - 28 = 12

3A - 2A = A

B - B = zero

hence A = 12

3 A = 36

Hence B = 4

thanks!

after reading your post, it suddenly occur to me that the diff between the two sentences is an A.

so if 40 - 28 = A, then A is 12.

28 - 12 - 12 = 4 (B is 4)

to confirm, 12 + 12 + 12 + 4 = 40

this way can?

[cookie]

ksi:

cookie:

this is from a P1 assessment book. although the answer is given, but i dont know how to teach my DS how to do the workings/solve it. anyone can advise? tks.


A + A + A + B = 40

A + A + B = 28

what is A and what is B?

A + (A + A+ + B) = 40
A + 28 = 40
A = 40 -28 = 12
B = 28 - 12 - 12 = 4

This is the \"see the pattern\" method.

yes ! thanks !
just saw the pattern :celebrate:

[verykiasu2010]

cookie:

verykiasu2010:

[quote=\"cookie\"]this is from a P1 assessment book. although the answer is given, but i dont know how to teach my DS how to do the workings/solve it. anyone can advise? tks.


A + A + A + B = 40

A + A + B = 28

what is A and what is B?

40 - 28 = 12

3A - 2A = A

B - B = zero

hence A = 12

3 A = 36

Hence B = 4

thanks!

after reading your post, it suddenly occur to me that the diff between the two sentences is an A.

so if 40 - 28 = A, then A is 12.

28 - 12 - 12 = 4 (B is 4)

to confirm, 12 + 12 + 12 + 4 = 40

this way can? [/quote]that is how i train my kid to visualise it

too early to solve the equation in P1

you can change it to A = apple and B = Orange to be less abstract for a start

after that the kid will pick up very fast

[cookie]

verykiasu2010:

cookie:

[quote=\"verykiasu2010\"]

40 - 28 = 12

3A - 2A = A

B - B = zero

hence A = 12

3 A = 36

Hence B = 4

thanks!

after reading your post, it suddenly occur to me that the diff between the two sentences is an A.

so if 40 - 28 = A, then A is 12.

28 - 12 - 12 = 4 (B is 4)

to confirm, 12 + 12 + 12 + 4 = 40

this way can?

that is how i train my kid to visualise it

too early to solve the equation in P1

you can change it to A = apple and B = Orange to be less abstract for a start

after that the kid will pick up very fast[/quote]will use this method, but when he doesnt really get it, i get 'worried'.
now he is still trying to figure out even after i explained to him.

must be my explanation is poor ...... haha

[verykiasu2010]

go to the fridge and take out the apples and orange .... :rotflmao:

[CoffeeCat]

Perhaps you can substitute real numbers just as an illustration.