Q&A - P4 Math

[Breadandmuffins]

THank you everyone. Will continue to learn . Just last nite, I was cracking my head over some more questions to help DS revise for his SA1.


Hi Optimistforum, that qn is taken from the Onsponge book which DS used in school. I had a hard time trying to figure out as well. See stars every nite.

[teh_oh]

atutor2001:

ozora:

need help:

1)2 similar shirts cost $26 more than 3 pairs of shoes. If their total cost is $158. find the cost of 1 shirt.

2) shop A had 164 more customers than shop B.
after 1/4 of the customers in shop A went to shop B. there were 48 more customers in shop B than shop A.
How many customers were there in shop A and shop B now?

Algebra is the easier way. Anyway, if you wish to solve it using logical thinking, a possible way is as follows :

A is 164 more than B.
To make A and B equal, 164/2 = 82 must move from A to B
To make B more than A by 48, another 48/2 = 24 must move from A to B
(common mistake is in forgetting to divide by 2)

So a total of 82 + 24 = 106 must move from A to B so that B will be 48 more than A.

This 106 is 1/4 of the original number in A.

So the original number in A is 4 quarters, that is 106 x 4 = 424
So the original number in B is 424 - 164 = 260

The number in A now is 424 - 106 = 318
or
The number in A now is 3/4 of the original 3/4 x 424 = 318

The number in B now is 260 + 106 = 366

Personally I don't recommended this way to solve. Too much thinking needed.

Hi atutor2001,

My child's working is as follows:
164 - 48=116
116 divide 2 = 58
58 + 48 = 106
1/4 --> 106
4/4 - 1/4 = 3/4
106 x 3 = 318 (Shop A)
318 + 48 = 366 (Shop B)

Is my child's workings acceptable?

Thank you.

[24hr-mum]

small:

24hr-mum:

for qn such as: if the teacher shares her sweets wf 5 pupils she wil hv 3 sweets left, if she share wf 6 pupils she wil b short of 7 sweets, how many sweet she has?any shortcut besides listg the multiples of 5 n 6? the clue gvn is she has more than 40 sweets

Hi 24hr-mum,

HTH...

As the number of sweets in both cases is the same thus the answer is 53 sweets.

Case 1: 5 students with extra of 3 sweets
Case 2: 6 students with short of 7 sweets



my gal math teacher say conceptuallu wrong to say 1 student has 10 sweets

5 students + 3 sweets = 6 students - 7 sweets
1 student = 10 sweets

From case 1 ------(5x10 )+3 = 53 sweets

[sunshine0809]

http://i49.tinypic.com/5k3nyh.jpg\">

Ans 146

[Sharmum]

Hi,


May i know if theres a shorter method?

:?

http://i50.tinypic.com/dfehhg.jpg\">

[small]

small:

24hr-mum:

for qn such as: if the teacher shares her sweets wf 5 pupils she wil hv 3 sweets left, if she share wf 6 pupils she wil b short of 7 sweets, how many sweet she has?any shortcut besides listg the multiples of 5 n 6? the clue gvn is she has more than 40 sweets

Hi 24hr-mum,

HTH...

As the number of sweets in both cases is the same thus the answer is 53 sweets.

Case 1: 5 students with extra of 3 sweets
Case 2: 6 students with short of 7 sweets

24hr-mum:

my gal math teacher say conceptuallu wrong to say 1 student has 10 sweets

5 students + 3 sweets = 6 students - 7 sweets
1 student = 10 sweets

From case 1 ------(5x10 )+3 = 53 sweets

Hi 24hr-mum,

Pictorial diagram will be easier to understand.

http://i50.tinypic.com/9an6v6.jpg\">

[small]

Sharmum:

Hi,


May i know if theres a shorter method?

:?

http://i50.tinypic.com/dfehhg.jpg\">

Hi Sharmum,

Please refer to attached pic, HTH.

http://i48.tinypic.com/2llecjs.jpg\">

[Jamesbond]

A set of two blouses costs $41. Ivy found out that she could only buy 4 blouses but not more than 6 blouses with the amount of money she had. What is the possible amount of money she had?

1) $50 2) $90
3) $150 4) $250

Answer is option 2.

Pl explain me this in detailllll....VVVVV urgent......I donno..... :yikes:

[Champion]

Jamesbond:

A set of two blouses costs $41. Ivy found out that she could only buy 4 blouses but not more than 6 blouses with the amount of money she had. What is the possible amount of money she had?

1) $50 2) $90
3) $150 4) $250

Answer is option 2.

Pl explain me this in detailllll....VVVVV urgent......I donno..... :yikes:

P4 dd1 answer: 2 blouses $41 then 4 blouses will be $41 x 2 = $84. Therefore $84 nearest is $90; Answer (2).

[Jamesbond]

thanks a lot