Q&A - P5 Math

[tianzhu]

pineapple tarts:

Dear Tianzhu, it's 4O leh.

Hi

Where is this question from?

If it’s 40, you’ll end up having decimals.

If it’s 44, the answers are

First

140 boys and 84 girls

Final

96 boys and 128 girls

Best wishes

[pineapple tarts]

tianzhu:

pineapple tarts:

Dear Tianzhu, it's 4O leh.

Hi

Where is this question from?

If it’s 40, you’ll end up having decimals.

If it’s 44, the answers are

First

140 boys and 84 girls

Final

96 boys and 128 girls

Best wishes

Dear Tianzhu,

Question is from Rosyth SA2 2011 for P5.

Thank you for your kind effort to solve so many problems. It is really helpul.
:thankyou:

[happyheart]

tianzhu:

happyheart:

please help. Thank you in advance!


Q) Ali used some rectangular and square tiles to make a wall design. The rectangular tiles were sold at 3 for $12 and the square tiles were sold at 2 for $6. If he spend $546 on an equal number of rectangulars and square tiles, how many rectangular Nd square tiles dis he use altogether?

Hi

We need an equal number of rectangular and square tiles.

A common multiple of 2 and 3 is 6

Consider 1 group of 3 rectangular tiles

2 groups ------- 6 rectangular tiles --------$24

Consider 1 group of 2 square tiles

3 groups ------- 6 square tiles --------$18

A set of 6 rectangular tiles and 6 square tiles -------$42

546/42 ------- 13

There are 13 sets.

Hence 13*6*2 ------- 156

Best wishes

Why didn't I think of it? Thank you, Tianzhu.

[tianzhu]

pineapple tarts:

Dear Tianzhu,

Question is from Rosyth SA2 2011 for P5.

Thank you for your kind effort to solve so many problems. It is really helpul.
:thankyou:

Hi

At 2p.m. the ratio of the nos. of girls to the nos. of boys at the library was 5:3.

It should be read as 5:4.In this case 40 is correct.

Best wishes

[pineapple tarts]

tianzhu:

pineapple tarts:

Dear Tianzhu,

Question is from Rosyth SA2 2011 for P5.

Thank you for your kind effort to solve so many problems. It is really helpul.
:thankyou:

Hi

At 2p.m. the ratio of the nos. of girls to the nos. of boys at the library was 5:3.

It should be read as 5:4.In this case 40 is correct.

Best wishes

alamak!! sorry sorry very sorry. :oops:

[tianzhu]

pineapple tarts:

alamak!! sorry sorry very sorry. :oops:

Hi

No worries, let’s move on to do the revised question.

There are a few ways to go about doing this question.

It’s useful if students are able to see that the number of children in the library stays the same before and after.

Make the total number of units the same in both scenarios.

At first (at 2 pm)

Girls : Boys ------ 5:4 (9) ------ 35:28 (63)

Change

Girls : Boys ------ -40:+40

In the end (after 2pm)

Girls : Boys ------ 3:4 (7) ------ 27:36 (63)

8 units ------ 40

1 unit ------ 5

Number of girls @ first ------ 35*5 ------ 175

36 – 27 ------ 9

9*5 ------- 45

There are 45 more boys than girls after 2 pm.

Best wishes

[pineapple tarts]

Hi, pls advise.


Jenny bought some strawberries and wanted to put them into boxes. If she put 4 strawberries into each box, there will be 3 strawberries left. If she put 6 strawberries into each box, there will be 5 strawberries left.

(a) if the nos. of strawberries is btw 100 - 150, how many strawberries did Jenny buy?
(b) if Jenny decided to put all strawberries equally into 16 bags, what is the minimum nos. of bag she would need?

Thank you.

[pineapple tarts]

tianzhu:

pineapple tarts:

alamak!! sorry sorry very sorry. :oops:

Hi

No worries, let’s move on to do the revised question.

There are a few ways to go about doing this question.

It’s useful if students are able to see that the number of children in the library stays the same before and after.

Make the total number of units the same in both scenarios.

At first (at 2 pm)

Girls : Boys ------ 5:4 (9) ------ 35:28 (63)

Change

Girls : Boys ------ -40:+40

In the end (after 2pm)

Girls : Boys ------ 3:4 (7) ------ 27:36 (63)

8 units ------ 40

1 unit ------ 5

Number of girls @ first ------ 35*5 ------ 175

36 – 27 ------ 9

9*5 ------- 45

There are 45 more boys than girls after 2 pm.

Best wishes

The 8 units is from 35-27 correct? I'm trying to digest the solution so tt I can explain to my DD \"confidentally\" kee...

[tianzhu]

pineapple tarts:

The 8 units is from 35-27 correct? I'm trying to digest the solution so tt I can explain to my DD \"confidentally\" kee...

Hi

You're correct.

Either 35 - 27 or 36 - 28.

Best wishes

[tianzhu]

pineapple tarts:

Hi, pls advise.


Jenny bought some strawberries and wanted to put them into boxes. If she put 4 strawberries into each box, there will be 3 strawberries left. If she put 6 strawberries into each box, there will be 5 strawberries left.

(a) if the nos. of strawberries is btw 100 - 150, how many strawberries did Jenny buy?
(b) if Jenny decided to put all strawberries equally into 16 bags, what is the minimum nos. of bag she would need?

Thank you.

Hi

Where is this question from?

There will be multiple answers of 107, 119,131 or 143.

The answers chosen for (a) will affect the answer for (b).

Best wishes