Tutor MathsGuru: Ask me for your burning Maths questions!

[Dharma]

tianzhu:

Hi Dharma


Thank you for your reply.

I think we are not talking about the same thing. I am sorry for not making it clear in my earlier post.

Let’s not focus in what were asked to find in the Rosyth question.

I brought it up to show the similarity between the Rosyth and the new question in certain aspects.

The ratios in one question are given while in the other, they are not.

If the speed ratios are given, a student can easily show that they would meet at the third period of time.

The question is how does one knows that they’ll meet at the third period of time if the speed ratios are not given?

In the third interval of time, Raju makes a U turn, do we assume that he does it at the third period?

If we make an assumption that they would meet at the third period of time, then this question could be solved with visual representation by showing a distance line.

Best wishes

Hi Tianzhu,

For this question, when they meet for the 1st time, both take the same time (fixed time).
We found out that Town A to P is 10km and Town B to P is 13km. So, the distance ratio of Raju : Ali = 10 : 13 and their speed ratio will also be 10 : 13. The speed ratios will ontinue to be the same so long as they do not change their speeds.

They will meet for the 3rd time, 4th time and so on if they continue moving back and forth between Town A and Town B.

If they set off from the same point but in opposite directions, their total distance from the time they move to the time they meet again will be twice the sum of the total distance of Town A and Town B.

“ In the third interval of time, Raju makes a U turn, do we assume that he does it at the third period? “.Yes.

If they continue their travelling they will meet at Point R which is 4km from Town A and it can be seen by drawing a distance line.

[tianzhu]

Dharma:

“ In the third interval of time, Raju makes a U turn, do we assume that he does it at the third period? “.Yes.

Hi Dharma

Thank you for your reply.

The starting point is to make an assumption that they turn at the third period of time.

Once a student is able to do it, this question could be easily solved by drawing a distance line.

Best wishes

[peapot]

Hi, I have encounter a P1 math problem. Please see pic below. I found out the answer by trial and error but is there a systematic approach to solve this question. I do not understand how to teach my P1 gal on this type of question. Please help me!

Thanks!!


http://postimage.org/image/3393pe1s4/
[/img]

[Dharma]

peapot:

Hi, I have encounter a P1 math problem. Please see pic below. I found out the answer by trial and error but is there a systematic approach to solve this question. I do not understand how to teach my P1 gal on this type of question. Please help me!

Thanks!!


http://postimage.org/image/3393pe1s4/
[/img]

Find the number bonds of 11

6 + 4 + 1
6 + 3 + 2
5 + 4 + 2

The numbers 2, 4 and 6 appear twice. These numbers must be placed at the corners and 1,3 and 5 will be the middle numbers.

[peapot]

Thanks for you help. But I still don’t quite get it. Why those numbers appear twice must by placed in the corner circle? Hmmm…is there any rule I can follow to explain why the numbers appear twice must be place in the corner?


Pardon me but my maths was quite lousy why I was younger.

[rubydoll]

My son told the maths paper was easy.

I thank the mathsguru team and esp Mr Dharma and Sweet girl vanilla cake for the marvellous work in helping us understand the sums.
Thank you again.
GOD BLESS YOU ALL.

[Dharma]

peapot:

Thanks for you help. But I still don't quite get it. Why those numbers appear twice must by placed in the corner circle? Hmmm.....is there any rule I can follow to explain why the numbers appear twice must be place in the corner?


Pardon me but my maths was quite lousy why I was younger.

Number that appear twice in the number bonds abovve is shared between 2 sides of the triangle. If u place 6 at the top most circle, 6 is common to the number bonds on the 2 sides of the triangle.

Similarly, 2 and 4 will have be shared by 2 different number bonds. Draw the numbers on the circle and you will see it clearly.

[Dharma]

rubydoll:

My son told the maths paper was easy.

I thank the mathsguru team and esp Mr Dharma and Sweet girl vanilla cake for the marvellous work in helping us understand the sums.
Thank you again.
GOD BLESS YOU ALL.

Hi rubydoll,

It is nice hear that your son found the paper easy and best wishes to him.

[peapot]

Oh ya!! How silly of me!! Now I understand…thanks!! Btw, can I use this same method for other questions of this nature?


You want to give tuition? My gal needs help leh!!

[oovi-yah]

zara had 70 more dresses than skirts.she sold 3/4 of the dresses and 3/5 of the skirts.she sold 126 more dresses than skirts .what fraction of the remaining clothes that zara had were skirts?