Q&A - PSLE Math

[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.

[cimman]

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]I think this question is poorly set. How many questions would he have solved altogether could be the total number of questions set, ie. 100% or it could mean the number of questions that had been completed up to the 4 days. The word \"altogether\" is pretty vague on what it means. I hope PSLE questions are a lot clearer.

[tianzhu]

Hi Michaelia0816


Ah girl,I observe you’ve posted quite a few questions involving changing ratios.

Perhaps, the concept has not been communicated effectively to you.

Questions of such genre can be solved with MD, SL or UP.

Today, I’ll share with you a slide showing the solution by UP.

UP is a useful tool which is applicable to a range of questions.

Try it understand it and it should serve you well for your examinations.

I hope it’ll be useful to you.

Best wishes

http://farm8.staticflickr.com/7095/7163005136_13d9019a96_z.jpg\">

[Michaelia0816]

[quote]

You meant Unit and Part Method (UP), I tried to find the ways to solve using it, I also think UP is the best way, but sometime, I do forget how to use it!!!
http://farm8.staticflickr.com/7095/7163005136_13d9019a96_z.jpg\">[/quote]

[kuts]

Andy, George and Dim agreed to buy present together. Andy agreed to contribute 30% of the cost of the present. George agreed to contribute 2/5. The balance will be paid by Dim. However, when they went to the shop, the cost of the present increased by 25%. As a result, Andy paid $84. a. What is the original price of the present

b. HOw much did Dim had to pay at the end?