Q&A - P3 Math

[jolenekoh]

:thankyou: Tianzhu


Still learning...hahaha...like back to school again

tianzhu:

jolenekoh:

Hi all

Is my answer correct? Thank you


Ron and Sam had 948 stickers altogether. After Sam bought 52 stickers, Sam would have thrice as many stickers as Ron. How many stickers did Ron have at first?


4U = 948 + 52 = 1000
1U = 1000 / 4 = 250

Sam : 3 x 250 = 750
At first Sam had } 750 - 52 = 698

Hi

Yes, you're moving towards the right direction

Sam ------ 698

Ron ------ 250 at first (Ans)

Best wishes

[tianzhu]

jolenekoh:

Still learning...hahaha...like back to school again

Hi

Good Morning.

You’re welcome.

Schools do conduct Maths workshops for parents.

You may wish to check with the school teacher.

Best wishes

[tianzhu]

bbc:

A packet of cookies was shared equally among 9 children. If 4 more children joined in, each child would get 8 fewer cookies. How many cookies were there in the packet?

Hi

Good morning.

9*8 ----- 72

72/4 ----- 18

Number of cookies ----- 18*13 ----- 234

Best wishes

[angel]

Hi experts. Need help in this question with models.


Samuel is 3 times as old as his brother now. in 10 years time, their total age will be 48 years old. How old is Samuel now?

[PapayaDad]

Now

S=3u
Sb=u

10 years
S=3u+10
Sb=u+10
Total = 4u+20=48
4u=28
u=7

Now
S=3u = 3 x 7 = 21
Samuel is 21 now

[angel]

Can you explain using models? I understood your explanation but I try to refrain using algebra to teach my kiddo.


Thanks a lot.

[tianzhu]

angel:

Can you explain using models? I understood your explanation but I try to refrain using algebra to teach my kiddo.


Thanks a lot.

Hi

Hope this helps.

Best wishes

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[angel]

Thank you Tianzhu, I got it now.

[jolenekoh]

May I know how to explain to kid?


Mrs Chua bakes some tarts to distribute to her neighbours
When she gives each of them 4 tarts, she will have 6 extra tarts.
When she gives each of them 6 tarts, she will need to bake another 4 tarts more. How many neighbours does she have?





Alan, Benny and Calvin have 120 stamps altogether. Alan has 5 stamps more than Benny. Benny has twice as many stamps as Calvin.
How many stamps does Calvin have/



Thank you

[tianzhu]

jolenekoh:

May I know how to explain to kid?


Mrs Chua bakes some tarts to distribute to her neighbours
When she gives each of them 4 tarts, she will have 6 extra tarts.
When she gives each of them 6 tarts, she will need to bake another 4 tarts more. How many neighbours does she have?

Hi

The common method used in P3 maths is Systematic Listing (SL).

Please use this slide (P5 question) as an example), the approach is the same.

A quicker way is to use the concept of “Excess and Shortage” .

In the first scenario, the excess is 6 tarts.

In the second scenario, there is a shortage of 4 tarts.

In order to give each of her neighbours two more tarts, Mrs. Chua needs to bake 10(6+4)) more tarts.

Difference in number of tarts given to each neighbor ------ 6 - 4 ------ 2

Number of neighbours ------- (6+4)/2 ------- 5

Best wishes

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