Q&A - P4 Math

[tianzhu]

Cher2101:

Can anyone help me to explain how to teach my kid on this question:


Mrs Goh had a sum of money . If she bought 32 apples and 9 oranges, she would have $10.40 left. If she bought 12 apples and 24 oranges , she would have $14.40 left. Given that she had $30, how many apples and oranges could she buy?

Thanks and regards

Hi

32 apples + 9 oranges ------ 19.6

12 apples + 24 oranges ------ 15.6
(divide by 12)
1 apple + 2 oranges ------- 1.3

Make the number of apples the same.
(x32)
32 apples + 64 oranges ------- 41.6

(minus)

32 apples + 9 oranges ------ 19.6

55 oranges ------- 22
1 orange ------- 0.4

1 orange ------- 40 cents
1 apple ------- 50 cents

Number of apples ------- 60
Number of oranges ------- 75

Best wishes

[Taurus]

Hi,


Kindly help to solve these 2 qns :

1. Siti, Rahmesh and Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away and Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.

2. Siti had 6 times as many apples as David at first. Siti had given 450 apples to David, they had an equal number of apples.
A) Find the number of apples David had at first.
B) David gave away some apples and had half the number of apples Siti had. How many apples did David give away?

Thanks.

[kwcllf]

Taurus:

Hi,


Kindly help to solve these 2 qns :

1. Siti, Rahmesh and Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away and Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.

2. Siti had 6 times as many apples as David at first. Siti had given 450 apples to David, they had an equal number of apples.
A) Find the number of apples David had at first.
B) David gave away some apples and had half the number of apples Siti had. How many apples did David give away?

Thanks.

It was posted before. But there is a mistake. It should be Siti bought 33 stickers instead of 32 stickers.

Change 32 to 33, and you’ll get Siti ----- 171 stickers@first.

Due to time constraints, I’ll not draw the MD, just some pointers

In the end

Siti ------- 4u

Ramesh ------ 4u

Peter ------ 4u

At first

Siti ------- 4u – 33

Ramesh ------ 5u

Peter ------ 2u

11u ------ 561

1u ------ 51

You may continue from here.

[Taurus]

kwcllf:

Taurus:

Hi,


Kindly help to solve these 2 qns :

1. Siti, Rahmesh and Peter had 528 stickers at first. Siti bought another 32 stickers, Ramesh gave 1/5 of his stickers away and Peter was given as many stickers as he had at first by his father. In the end, all three of them had equal number of stickers. Find the number of stickers Siti had at first.

2. Siti had 6 times as many apples as David at first. Siti had given 450 apples to David, they had an equal number of apples.
A) Find the number of apples David had at first.
B) David gave away some apples and had half the number of apples Siti had. How many apples did David give away?

Thanks.

It was posted before. But there is a mistake. It should be Siti bought 33 stickers instead of 32 stickers.

Change 32 to 33, and you’ll get Siti ----- 171 stickers@first.

Due to time constraints, I’ll not draw the MD, just some pointers

In the end

Siti ------- 4u

Ramesh ------ 4u

Peter ------ 4u

At first

Siti ------- 4u – 33

Ramesh ------ 5u

Peter ------ 2u

11u ------ 561

1u ------ 51

You may continue from here.

Thanks for your help.

[cftan]

Hi,


I need help on the below question. It looks simple but my mind is blocked.

Ali is 8 years older than Muthu. in 6 years’ time, Ali will be twice as old as Muthu. How old is Muthu now?

How can we solve this with model?

[PapayaDad]

in 6 years time


Ali = 2u
Muthu = u

Draw
<u><u> for Ali
<u> for Muthu

So u = 8
Ali = 16 (in 6 years time)
Ali = 10 now

[cftan]

Why is u = 8?


Btw, the answer provided is : Muthu is 2 years old now.

[tianzhu]

cftan:

Why is u = 8?


Btw, the answer provided is : Muthu is 2 years old now.

Hi

Muthu is 2 years old.

You may look at this similar question as an example.

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8256/8639626358_d56389ea69_z.jpg\">

[tianzhu]

Taurus:

2. Siti had 6 times as many apples as David at first. Siti had given 450 apples to David, they had an equal number of apples.
A) Find the number of apples David had at first.
B) David gave away some apples and had half the number of apples Siti had. How many apples did David give away?

Thanks.

Hi

This question has been discussed before.

Please go to page 207 of this thread.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=66&t=149&start=2060

Best wishes

[cftan]

tianzhu:

cftan:

Why is u = 8?


Btw, the answer provided is : Muthu is 2 years old now.

Hi

Muthu is 2 years old.

You may look at this similar question as an example.

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8256/8639626358_d56389ea69_z.jpg\">

Thank you.