Q&A - P3 Math

[cimman]

PiggyLalala:

Not really algebra. I would rather relate this question to question like

+ :imcool: = 8
:imcool: + :dancing: 10
+ :dancing: =6.
Find the value of .

We observe that if we add all, we will have 2( + :imcool:+ :dancing: ) = 24.
( + :imcool:+ :dancing: ) = 12
therefore = 12 -10 = 2.
Such questions are common in P2 assessment book.

I would still say this is basic algebra. Just replace the symbols with x,y,z and you'll have algebra. Just because it is taught in P2 doesn't mean it is not algebra. They're teaching basic algebra in P2, just packaged differently with the symbols.
There's 3 unknowns, 3 equations and you're adding the 3 equations together, that's algebra with symbols. Well, x,y,z are symbols too that represents unknowns.

[ozora]

hi need help on the following question,

Q1. John had 1/3 as many red marbles as blue marbles. If he bought 12 red marbles, he would have 2/5 as many red marbles as blue marles. How many marbles did he have altogther?

[Concerndad]

Hi…ozora…



Q1. John had 1/3 as many red marbles as blue marbles. If he bought 12 red marbles, he would have 2/5 as many red marbles as blue marles. How many marbles did he have altogther?


Ans:

Before…
rm []
bm [][][]

After…(bought 12 red marbles)
rm [][]
bm [][][][][]

(the amt. of blue marbles remain the same…)
3 x 5 = 15units
(this is to make the ‘before’ n ‘after’ blue marbles have the same no. of units)

1 x 5 = 5units
(make the ‘before’ red marbles’ unit same as the ‘after’)

2 x 3 = 6units
(make the ‘after’ red marbles’ unit same as the ‘before’)

(the revise ‘before’ become…)
Before
rm [][][][][]
bm [][][][][][][][][][][][][][][]

(the revise ‘after’ become…)
After
rm [][][][][][]
bm [][][][][][][][][][][][][][][]

(the rm increase by 1unit)
6units - 5units = 1unit
1unit -> 12
20units -> 20 x 12 = 240

John has 240marbles altogether.

Hope this helps…
Those info in the brackets need not be in the answer…it is to help to make clear the model steps, I made.
rgds,
concerndad

[ozora]

Concerndad:

Hi..ozora...



Q1. John had 1/3 as many red marbles as blue marbles. If he bought 12 red marbles, he would have 2/5 as many red marbles as blue marles. How many marbles did he have altogther?


Ans:

Before...
rm []
bm [][][]

After...(bought 12 red marbles)
rm [][]
bm [][][][][]

(the amt. of blue marbles remain the same...)
3 x 5 = 15units
(this is to make the 'before' n 'after' blue marbles have the same no. of units)

1 x 5 = 5units
(make the 'before' red marbles' unit same as the 'after')

2 x 3 = 6units
(make the 'after' red marbles' unit same as the 'before')

(the revise 'before' become..)
Before
rm [][][][][]
bm [][][][][][][][][][][][][][][]

(the revise 'after' become...)
After
rm [][][][][][]
bm [][][][][][][][][][][][][][][]

(the rm increase by 1unit)
6units - 5units = 1unit
1unit -> 12
20units -> 20 x 12 = 240

John has 240marbles altogether.

Hope this helps...
Those info in the brackets need not be in the answer...it is to help to make clear the model steps, I made.
rgds,
concerndad

thanks
I used ratio but my nephew only p4 doesn;t know how to use ratio. Your model answer is a great help.
thanks again

[MathIzzzFun]

ozora:

hi need help on the following question,

Q1. John had 1/3 as many red marbles as blue marbles. If he bought 12 red marbles, he would have 2/5 as many red marbles as blue marles. How many marbles did he have altogther?

Hi

model approach

http://www.flickr.com/photos/62167097@N02/5831671194/in/photostream

cheers.

[ozora]

MathIzzzFun:

ozora:

hi need help on the following question,

Q1. John had 1/3 as many red marbles as blue marbles. If he bought 12 red marbles, he would have 2/5 as many red marbles as blue marles. How many marbles did he have altogther?

Hi

model approach

http://www.flickr.com/photos/62167097@N02/5831671194/in/photostream
oic. thanks


cheers.

[Concerndad]

Hi..ozora


Glad to be of help.
:welcome:

[smartmummy]

ozora:

hi need help on the following question,

Q1. John had 1/3 as many red marbles as blue marbles. If he bought 12 red marbles, he would have 2/5 as many red marbles as blue marles. How many marbles did he have altogther?

is that p3 or p4?
thanks in advance.Wow maths harder and harder.My son now he is in p3.

[barney]

Hi need help on this question -

There were 303 children in 2 childcare centres. After 32 children were transferred from childcare centre A to centre B, there were still 15 more children in centre A than centre B. How many children were there in centre B before the transfer?
Appreciate some help and explanation from the experts here. Thank you.

[corneyAmber]

barney:

Hi need help on this question -

There were 303 children in 2 childcare centres. After 32 children were transferred from childcare centre A to centre B, there were still 15 more children in centre A than centre B. How many children were there in centre B before the transfer?
Appreciate some help and explanation from the experts here. Thank you.

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