Q&A - PSLE Math

[Michaelia0816]

tianzhu:

Michaelia0816:

16) Daniel had 40% as many marbles as Ethan. Daniel gave away 8 marbles to his brother and Ethan lost 40 marbles of his marbles in a game. Then, Daniel had half as many as Ethan.

A) How many marbles did Daniel have at first?
B) How many marbles did Ethan have at first?

Hi

You may use “Units and Parts”

At first
Daniel : Ethan -------- 2units :5 units

Change
Daniel : Ethan -------- -8 : -40

In the end
Daniel : Ethan -------- 1 part :2 parts

Equalise the parts

2 units – 8 ------- 1 part
(x2)
4 units – 16 -------- 2 parts

4 units – 16 -------- 5 units – 40
1 unit ------- 24Daniel@first -------- 48
Ethan@ first -------120

You may apply the same method for Q13.

Best wishes

I do not quite understand, but equalise the part in Q13 is strange because it got 3 part in 4u-15 but 1 part is 1/1/3-5 ???
I understand this type of question as the part 1 and 2 is simple.

Pls help in the Q13, parts only!!!

[Michaelia0816]

tianzhu:

Michaelia0816:

May I know what the answer? I would like to know.

Hi

I did it in a rush, please check.

The answer is 157.

Good luck.

Best wishes

Same as me!!!! Just for checking, do not rush, I got alot of time.

[tianzhu]

Michaelia0816:

Pls help in the Q13, parts only!!!

Hi

For Q13

At first
Joe:Rachel --------- 4units:3 units

Change
Joe:Rachel --------- 15 :8

In the end
Joe:Rachel --------- 3 parts:2 parts

4 units + 15 -------- 3 parts
(x2)
8 units + 30 -------- 6 parts

3 units + 8 -------- 2 parts
(x3)
9 units + 24 -------- 6 parts

8 units + 30 -------- 9 units + 24

1 unit -------- 6

Joe@first --------- 24

Best wishes

[Michaelia0816]

thank you again, i think I a bit too stubborn abot the parts, forget it could be equalised, i try not to do it in my examination!

[jarenchuatw]

To make each paper plane, Gina needed 6 min while Jolene needed 8 min. Both of them started making the paper planes at 12.30pm. At what time would they complete making 70 paper planes?

[small]

Hi,


Someone please help and TIA.

2011-P6-Math-SA1-Rosyth Paper 2 question 7, My DS's answer is 500 Math problems but was told that his answer is wrong. :?

Question
Raju has solved 260 Math problems to prepare for his mid year examinations. He planned to finish the rest of the Math problems in the next 6 days by solving the same number of Math problems each day. If he completed 32% of the Math problems in the next 4 days, how many Math problems would he have solved altogether?

[MathIzzzFun]

small:

Hi,


Someone please help and TIA.

2011-P6-Math-SA1-Rosyth Paper 2 question 7, My DS's answer is 500 Math problems but was told that his answer is wrong. :?

Question
Raju has solved 260 Math problems to prepare for his mid year examinations. He planned to finish the rest of the Math problems in the next 6 days by solving the same number of Math problems each day. If he completed 32% of the Math problems in the next 4 days, how many Math problems would he have solved altogether?

Hi

500 is that total number to be solved. Questions that he would have in the next 4 days = 260 + 32% --> 420.

cheers.

[small]

MathIzzzFun:

small:

Hi,


Someone please help and TIA.

2011-P6-Math-SA1-Rosyth Paper 2 question 7, My DS's answer is 500 Math problems but was told that his answer is wrong. :?

Question
Raju has solved 260 Math problems to prepare for his mid year examinations. He planned to finish the rest of the Math problems in the next 6 days by solving the same number of Math problems each day. If he completed 32% of the Math problems in the next 4 days, how many Math problems would he have solved altogether?

Hi

500 is that total number to be solved. Questions that he would have in the next 4 days = 260 + 32% --> 420.

cheers.

Hi MathIzzzFun,

Thank you very much for clearing our doubt.

[small]

jarenchuatw:

To make each paper plane, Gina needed 6 min while Jolene needed 8 min. Both of them started making the paper planes at 12.30pm. At what time would they complete making 70 paper planes?

Hi,

HTH.

CLM or 6 and 8 is 24

For every 24 min, Gina made 4 paper planes while Jolene made paper planes, so every 24 min there will be 7 paper planes made by the two girls.

7 paper planes ----- 24 min
70 paper planes ----- 240 min or 4 hours

As they started at 12.30pm, 4 hours later will be 4.30pm

[MathIzzzFun]

small:

MathIzzzFun:

[quote=\"small\"]Hi,


Someone please help and TIA.

2011-P6-Math-SA1-Rosyth Paper 2 question 7, My DS's answer is 500 Math problems but was told that his answer is wrong. :?

Question
Raju has solved 260 Math problems to prepare for his mid year examinations. He planned to finish the rest of the Math problems in the next 6 days by solving the same number of Math problems each day. If he completed 32% of the Math problems in the next 4 days, how many Math problems would he have solved altogether?

Hi

500 is that total number to be solved. Questions that he would have in the next 4 days = 260 + 32% --> 420.

cheers.

Hi MathIzzzFun,

Thank you very much for clearing our doubt.[/quote]Bonjour!

u r welcome

cheers.