Q&A - P3 Math

[Just4Good]

Atan:

peterch:

[quote=\"Atan\"]Pls help to solve this Question:


Tom had 160 more marbles than Ling at first. After Tom gave away 230 marbles, Ling had twice as many marbles as Tom. How many marbles did Tom have at first?

Thanks very much in advance!

1st:
TOM XXXXX XXXXX XXXXXX
LING XXXXX XXXXX ( 160 ) This is the difference

After Tom gave away 230:
TOM XXXXX ( 70 ) ( 160 ) Tom gave away 230 ( 160 + 70)
LING XXXXX XXXXX

XXXXX= 70

So at first TOM had 70 + 70 + 160 = 300 Marbles

Tks peterch, but we still don't understand why XXXXX=70, pls assist to explain further.[/quote] ________________
Tom l________________l
____________
Ling l___________ l 160

Tom gave away 230 marbles, and Ling had twice as many marbles as him.
_______ _____________________
Tom l_______l____ GAVE AWAY 230__l
______________
Ling l______________l 160

If Tom gave away 160 marbles ONLY, he would have as many marbles as Ling but he gave away 70 more. If you see properly, 70 is HALF of Ling's model. Since it's like this, Tom has 70 marbles NOW. You add the 230 he gave away, you get 300.

230-160=70
70+230=300.

Ans: 300 marbles.

[Atan]

Tks! All4Good and peterch. Earlier on, I thought that Tom gave away 230 marbles to Ling, so couldn't understand :oops: . So Sotong.

[just888]

Hi, I got problem trying to work this out:


Question:
Mrs A wanted to buy 24 cans of tuna, but she was short of $2. She bought 21 cans of tuna and had $2 left. How much money did she have at first?

MTIA.

[Suz855]

24-21=3

3 cans-->$4
21/3 = 7
7*4=28
28+2=30

She has $30 at first.

[just888]

Suz855:

24-21=3

3 cans-->$4
21/3 = 7
7*4=28
28+2=30

She has $30 at first.

Thanks alot.

[Thein]

http://i42.tinypic.com/15qqkpg.jpg\">

[24hr-mum]

i know this is from cath hi.

at least i thot they are supposed to find out cost of 1 unit, ie $4/3=$1.33.
but p3 havent learn decimal, oh i thot cath hi so advanced, test p4 work.
now then i know its not a decimal question…

[Andaiz]

24hr-mum:

i know this is from cath hi.

at least i thot they are supposed to find out cost of 1 unit, ie $4/3=$1.33.
but p3 havent learn decimal, oh i thot cath hi so advanced, test p4 work.
now then i know its not a decimal question....

Hehe! I had the same initial thought...then I realized they were testing the kids on multiplication and division of fractions within the model :oops: really gotta combine all those \"topics\". I loike!

[just888]

Yes 24hr-mum, it is from CH.

I only managed to figure out 3 for $4. Then I tried to divide $4 by 3.
Didn’t occur to me to consider the multiples of 3 which is 21 and 24. Silly me.

[smartmummy]

Hi All!


Pls help in the following Q
corvan has 26 toy trains and 8 times as many stickers . How many stickers have in all?
Thanks