Q&A - P3 Math

[angel]

Nathan had 12kg of rice at first. He gave 1/4 of his rice to his mother. Then he gave 2/3 kg of his rice to a Neighbour. How much rice has he left?


I ended up 2 different answers. Is the answer 1kg or 3kg? Kindly advice.

[Oldschool]

angel:

Nathan had 12kg of rice at first. He gave 1/4 of his rice to his mother. Then he gave 2/3 kg of his rice to a Neighbour. How much rice has he left?


I ended up 2 different answers. Is the answer 1kg or 3kg? Kindly advice.

Hi,

In this case, the answer is 1kg.

The answer would be 3kg if \"he gave 2/3 of the remainder to his neighbor\".

Regards

[angel]

Thank you oldschool for your 'rescue'.

[doraemo]

Please help:


1)\tMrs Png and Mrs Fu shared a sum of money equally. After Mrs Png gave $880 to Mrs Fu, how much more money did Mrs Fu have than Mrs Png?


2)\tJane had 110 fewer cookies than Sharon. How many cookies must Sharon give to Jane so that Sharon would have 50 more cookies than Jane?

[jieheng]

doraemo:

Please help:


1)\tMrs Png and Mrs Fu shared a sum of money equally. After Mrs Png gave $880 to Mrs Fu, how much more money did Mrs Fu have than Mrs Png?


2)\tJane had 110 fewer cookies than Sharon. How many cookies must Sharon give to Jane so that Sharon would have 50 more cookies than Jane?

1)

F [-----][880]
P [-----][880]

F [-----][880][880]
P [-----]

880*2 = 1760

2)

S [-----][------110--------]
J [-----]

S [-----][-----60----][-50-]
J [-----]

S [-----][-30-][-30-][-50-]
J [-----]

S [-----][-30-][-50-]
J [-----][-30-]

110 - 50 = 60

60 / 2 = 30

[doraemo]

Thank you, jieheng .

[cherrygal]

Oldschool:

angel:

Amy and Betty shared 200 cookies. After Amy ate 30 cookies and Betty baked another 28 cookies, they had the same number of cookies. How many cookies did Betty have at first?

Hi,

http://i44.tinypic.com/2zgt1cp.jpg\">

Regards

Sorry, can you kindly explain the rationale for this question? Got trouble understanding the model. Thanks

[Oldschool]

cherrygal:

Oldschool:

[quote=\"angel\"]Amy and Betty shared 200 cookies. After Amy ate 30 cookies and Betty baked another 28 cookies, they had the same number of cookies. How many cookies did Betty have at first?

Sorry, can you kindly explain the rationale for this question? Got trouble understanding the model. Thanks[/quote]Hi,

Probably, this would be clearer.

http://i43.tinypic.com/9gym2w.jpg\">

Regards

[cherrygal]

Thanks oldschool but how did you get the value of U as 71? Can show the working before U = 71? Method of achieving 71 looks a bit different from what his teacher wanted yesterday. Will check once we get that practice paper back.


Is this possible? Thought I saw something like this in his paper.
200 - 30 - 28 = 142
142 / 2 = 71
U = 71

[Oldschool]

cherrygal:

Thanks oldschool but how did you get the value of U as 71? Can show the working before U = 71? Method of achieving 71 looks a bit different from what his teacher wanted yesterday. Will check once we get that practice paper back.


Is this possible? Thought I saw something like this in his paper.
200 - 30 - 28 = 142
142 / 2 = 71
U = 71

Hi,

Yep, just by working

U + 28 + 30 + U = 200
2U + 58 = 200
2U = 200 - 58
2U = 142
U = 71

Regards