Q&A - P2 Math

[pjlee25]

Hi,


Came across this question but I do not know what method can be used to solve it. Don’t think I can use algebra, right?

Q: Jane has equal number of apples and oranges. After giving 9 apples away, and Jane has 2x as many oranges as apples. How many fruits did Jane has at first?

Thanks in advance. Cheers!

[Michaelia0816]

P2 don learn algebra only P6 but this question is only for algebra method but you also may solve it,not using algebra.

The answer is 18
the method is 9x2
Check
18-9=9
9x2=18

[teachingmum]

No of oranges remains unchanged.


Now,

oranges –> 2 units
apples –> 1 unit

At first,

oranges –> 2 units
apples –> 2 units
** same no of apples and oranges

Thus,
1 unit –> 9
** gave 1 unit of apples away

4 units –> 9 X 4 = 36
** 2 units of apples and 2 units of oranges

36 fruits altogether.

PS: easier to draw model…

[pjlee25]

Got it!!


Thanks, Michaelia0816 and teachingmum!

[Michaelia0816]

Actually you don need to thank me I not such a good explainer than teaching mum

[forestcadee]

Hi, all, would appreciate if anyone can enlighten me on how to explain/solve the following question to a P2 kid. Thanks


http://i45.tinypic.com/dpu974.jpg\">

[jon00]

Using guess and check method:

10-5= 5; 10x5= 50
9-4= 5; 9x4= 36
8-3= 5; 8x3= 24

Therefore the 2 numbers are 9 and 4.

[forestcadee]

Hi, jon00, thank you for your help. Would like to know the answer for the following question.


Mr. Low had 4 baskets of watermelons. There were 7 watermelons in each basket. He sold 9 watermelons.

a)How many watermelons did he have altogether? (Is 28 or 19?)

[Michaelia0816]

forestcadee:

Hi, all, would appreciate if anyone can enlighten me on how to explain/solve the following question to a P2 kid. Thanks


http://i45.tinypic.com/dpu974.jpg\">

First find the factor needs to multiple into 36, list them out like
1 and 36, 2 and 18, 3 and 12, 4 and 9 and 6 and 6.
Minus like this:
36-1=35. So wrong
18-2=16. So wrong too
12-3= 9. So wrong too
9-4=5. And correct as it was what the question looking for.
So the was 9 and 4!

[Michaelia0816]

forestcadee:

Hi, jon00, thank you for your help. Would like to know the answer for the following question.


Mr. Low had 4 baskets of watermelons. There were 7 watermelons in each basket. He sold 9 watermelons.

a)How many watermelons did he have altogether? (Is 28 or 19?)

I think it is 19 as it did not say \"now\". I also think it 28 as it also did not say \" at first\" still my final answer is 19.