Author Topic: 50 Matcounts lectures pdf files  (Read 18992 times)

fzhu99

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Re: 50 Matcounts lectures pdf files
« Reply #15 on: January 02, 2013, 11:20:31 AM »
对于我们订阅的读者 for AMC Training Session,
1)有许多typo.
2)我们有一些chapters (e.g.: 29, 39-50) 没有收到,而且file name也比较乱(especially for first 4 chapters)。

能不能审阅、校对、整理后,把所有的50 chapters再一起刊登一次?
Thank you for your consideration.

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #16 on: January 02, 2013, 02:56:03 PM »
Thanks for the message.

Sorry for the confusion.

To get chapter 39-50, you need to register. The link is as follows:

http://www.mymathcounts.com/American-Math-Competition-Training-Session-%283%29.php

We are reviewing every page of the session 2 (chapter 26-38) right now. When we finish, we will post a copy of the file and send you a copy as well.

Happy New Year!

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #17 on: January 26, 2013, 03:47:10 PM »
from:    WK <[email protected]>
to:    ourmathcounts <[email protected]>
date:    Fri, Jan 25, 2013 at 10:46 AM
subject:    Re: 50 Mathcounts lectures pdf files

Thanks for the information. I looked through the book and like it. I am running a math enrichment program and would like to use it for the classes. I knew the authors had run a summer program using this materials. Do you have the ppt files to go with the book? If I could use this materials for classes, you book sale will also be promoted. Please let me know. Thanks.

W


yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #18 on: January 30, 2013, 09:44:06 AM »
January 29, 2013, 08:37:21 PM    
Subject: Thank you
From:   jliuee

大大的谢谢!你的书是太好了。从这本书,我女儿在六年级开始好好学数学。

-J


January 30, 2013, 10:43:21 AM
From: yongcheng3315:
 
Thank you so much for purchasing our 50 Mathcounts Lectures books and for the nice words. Please do not hesitate to contact me if I can be more helpful to you. Good luck!

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #19 on: February 04, 2013, 12:22:01 PM »
from:    [email protected]
to:    "[email protected]" <[email protected]>
date:    Sun, Feb 3, 2013 at 8:42 PM
subject:    Mathcounts Preparation

Hello,

I have several of your Mathcounts books, and just now, bought the State Preparation package from your website and am awaiting the link to access the material.  Your books are very good!

I have a question for you.  My 7th grader just got First Place in Chapter and wants very badly to try and get to Nationals from State.  What would your advice be for preparation?  Should she prepare using Nationals material or using State material?  I noticed on your website that you mentioned that to prepare for Chapter one should use State material.

Any other tips and advice?  She mostly loses points due to careless errors, and does not have time to check over her work.  Any other advice/input/tips would be greatly appreciated!

Thanks,
Rima


Sent from my iPad

________________________________________________

from:    ourmathcounts <[email protected]>
to:    Rima Lal <[email protected]>
date:    Sun, Feb 3, 2013 at 9:42 PM
subject:    Re: Mathcounts Preparation

Congratulations to your child!

One way to overcome careless mistakes is to do a lot of practice.

Your child needs to work on national problems in order to do good at state. One week before the test she needs to do a set (state sprint and target) of test every day. But do no math the day before the test.


If you need the past national problems, please let me know and I am happy to share with you.


Below are two messages that may be useful for your child. First message was from a boy who was in top 12 nationally and the second one was from a National Champion.

Good luck!

________________________________________________________________________________


Message subject:    Re: advice needed for state mathcounts
From:   
Sent:     7:46 pm
To:   



Sure, no problem.

Sprint:

Sprint was always my favorite round. At nationals, I missed two Targets but still managed to get into the Countdown because of my sprint score (it's also the first tie-breaker). So Sprint is important.

In the actual competition, I didn't follow any of the weird "start at the end" or "skip questions you can't get right away" strategies. I just blazed right through them. I guess part of this was based on my ability; I could do all of the problems (except maybe 1 or 2), it was just about how much time I spent on them. I found it most useful to finish all of the problems I started, unless I really was stuck, which didn't happen much. Anyway, my advice (assuming you get 20+ in practices) is to just go in order. The last ones are the hard ones, and they usually take longer, but all of the problems are worth the same amount, so it's best to make sure you do the easy ones.

At State, the biggest thing I can say about Sprint is to use the problem number to your advantage. If it's a #7, and the best you can come up with is like 20 separate cases, there's probably an easier way. This is also true only slightly of Team, and not at all of Target. On Sprint, the first few should get you warmed up, and I would expect to get half way in around 1/3 the total time.

To prepare, I would just find a hundred or so Sprint problems and work through them all in one or two sittings. Just doing problem after problem after problem helps you for Sprint.

Target:

Target has always been my worst round, except at Regionals. The key with Target is to get an answer quickly, and then check it in every way you know. I always solved both problems (or at least got an answer) and then went back and checked them. Occasionally, I checked the first before moving on, but you're right the first time a lot.

Make sure to read the problems at least twice and remember all of the little tricks they like to throw in, like converting square inches to square feet (x144), and anything else they might come up with.

To be honest, I don't know how to prepare for Target without just doing old tests.

That's all I can think of right now. Confidence is a great booster too, almost as much as sugar and caffeine.

No, I'm serious - lots of sugar helps you think faster. But that's coming from someone who never gets stressed, so it might be different for you. But I always had a pop or two and any donuts they had before the contests.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Message subject:    Re:  mathcounts help
From:   
Sent:     7:08 pm
To:   

Hello ,

I apologize for taking so long to get back to you. For some reason, I didn't receive an e-mail notification about your private message, and so I've neglected to check my PM inbox until now. Thank you for your kind words of support.

As for MathCounts advice, where do I begin. First, and perhaps most importantly, you must remember that MathCounts is just a competition, and there are more important things in the world. Also, while it's definitely nice to win or place highly at Nationals, the AMCs are *more* (loosely used term here) important.

Memorization is important, but how you apply your memorization is more important. For example, perhaps you know the binomial theorem. But do you know why it works exactly the way it does? Same logic goes for most every theorem or formula you memorize.

Avoiding careless mistakes is a very personal issue and difficult to deal with. Everybody has different things that cause them to make mistakes, and I suppose somehow identifying the situations in which you are prone to making mistakes is the best first step toward reducing the number of these mistakes you make. It's very difficult not to make careless errors; I personally never managed to get 8/8 on the Target Round at either State or Nationals in either of my years.

Finally, preparation in general consists of doing lots of problems. I remember doing every State and Nationals round in MathCounts history, as well as every Warmup, and Workout. However, simply doing 10,000 problems is not a guaranteed formula for success. Even if you get 29/30 on a sprint round, it's extremely important that you focus on the problem you missed, and understand exactly why you weren't able to solve it (didn't know a formula, didn't see a different approach, made a careless error, etc.). In fact, even if you get 30/30 or 46/46, unless you know you solved every problem in the fastest and most efficient possible way, you still have room to improve.

Good luck in your future endeavors,
Albert

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #20 on: February 07, 2013, 07:58:21 AM »
from:    [email protected]>
to:    ourmathcounts <[email protected]>
date:    Thu, Feb 7, 2013 at 7:46 AM
subject:    Re: 50 Mathcounts lectures pdf files

Hi Y,

My son just won the Chapter mathcounts this past Saturday and he really benefited a lot from studying your materials. Thank you very much. As he was preparing for the upcoming State competition, I was wondering if you can share with us the National problems and solutions for the past 3 years. I have done a lot of search on the internet but was only able to collect 2002-2009 National problems. If you have other materials that are free to share (or available to be ordered), please feel free to let me know. Thanks.

Happy Chinese New Year!

W
« Last Edit: February 07, 2013, 08:18:58 AM by yongcheng3315 »

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #21 on: February 11, 2013, 08:48:16 AM »
from:    [email protected]>
to:    "[email protected]" <[email protected]>,
 
date:    Sun, Feb 10, 2013 at 4:03 PM
subject:    Mathcounts


        Thank you so much for your great help on Mathcounts, my daughter is very benefit from the 50 lectures and she is advanced to the state now! 

        Thank you so much!

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #22 on: February 18, 2013, 12:11:35 PM »
Mon, Feb 18, 2013 at 12:18 PM, <[email protected]> wrote:

   
    Comment: Dear Sirs:
    In 50 Mathcounts Lectures v1, Exponents chapter, problem 50 on page 205, which is greater 7^{92} or 8^{91}, could you please guide me to a solution? Or even which Mathcounts Handbook this is taken from so that I can look up the solution?
    My daughter is working on this problem, and we seem stuck.
    Thanks,
    N

_______________________________________________________________________________________________

On Mon, Feb 18, 2013 at 11:39 AM, mymathcounts.com <[email protected]> wrote:

    This problem was from the book Math Circles by Dmitry Fomin. The book does not provide a solution.

    50. Which number is greater: 7^92 or 8^91?

    My solution:

    We know that 8^6 = 262144 and 7^6 = 117649, so 8^6/7^6 > 2 and (8/7)^18 > 8.

    8^91/7^92 = (8^91/7^91)*(1/7) = (8/7)^73*(8/7)^18*(1/7) > 1.

    So 8^91 > 7^92.

    Any better ways are welcome.

    Good luck!
______________________________________________________________________________

From: <[email protected]>
Date: Mon, Feb 18, 2013 at 12:57 PM
Subject: Re: Comparing Exponents
To: "mymathcounts.com" <[email protected]>


Thanks for the quick answer. Outstanding solution. I was able to wring out a solution using binomial expansions, but it's not as clean as your solution. Moreover, the binomial expansion seems a bit too advanced.

Do you know the reference to the problem in Fomin's book?

By the way, do you also have any books regarding SAT English? Or can you recommend what books you used for your's son's training. (In an earlier email, you had mentioned that your son was a Bevan Scholar.)
Thanks,
Nihal


yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #23 on: February 19, 2013, 06:20:42 PM »
On Tue, Feb 19, 2013 at 8:07 AM, mymathcounts.com <[email protected]> wrote:

    Thanks.

    The problem is on Chapter 16, page 175 of the book (problem #4).

    As for SAT English, I am not an expert on training it. Sorry I do not have much to say.

    Here is a link with some practice problems:

    http://www.whw.name/index.html


    Good luck!

_________________________________________________________________
from:    <[email protected]>
to:    "mymathcounts.com" <[email protected]>
date:    Tue, Feb 19, 2013 at 11:00 AM
subject:    Re: Comparing Exponents

Thanks for your reply. After I sent the email, I also found it.

By the way, and I know that I have mentioned this earlier too, but your books are awesome. With each chapter, they continue to amaze me even more.

Thanks,
Nihal
« Last Edit: February 19, 2013, 06:22:06 PM by yongcheng3315 »

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #24 on: February 25, 2013, 07:51:56 AM »
from:    Y & S S <[email protected]>
to:    myamc10and12 <[email protected]>
date:    Mon, Feb 25, 2013 at 12:12 AM
subject:    RE: AMC & MathCounts

I just ordered the 50 MathCounts Lecures (1,2,3 set) as you suggested.  Once we are done with those, I will order the 20/20 followed by AMC lectures.

Also, my son is doing the AoPS 6-8 th grade set (Algebra, Number Theory, Geometry, Counting & Probability, etc…).

Do you suggest we finish each chapter in AoPS and then, do yours?  I have heard lot of good things about your books.

Thank you and Best regards,

Y & S

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #25 on: March 06, 2013, 08:33:35 PM »
from:    YMZ <[email protected]>
to:    [email protected]
date:    Wed, Mar 6, 2013 at 8:11 PM
subject:    Thank you

Dear Yongcheng,
 I want to thak you for your help. My son got state second place during the mathCount competition on Mar 2nd. He will go to Washington DC in May. I don't think he can get good position at national level competition this time because he did not do national competition practice.

If you have time, I want to get suggestion from you. What he should do next step? If he want to get progress at national competition level, what books he should read?
Thank you again for your help.


________________________________________________________________________________________

from:    yongcheng3315 <[email protected]>
to:    YZ <[email protected]>
date:    Wed, Mar 6, 2013 at 9:30 PM
subject:    Re: Thank you

Dear Dr. Zhang,

Thank you for letting me know this great news! Congratulations to your
child! He has two more years to go. Next year I am sure he will be
more than ready.

Next step will be practicing with all the national problems and AMC 10
problems.

We also have a sub forum we used to train national
competitors before, called national playfield. There are many good
mock tests at national levels.

Let me know your user name if you have one so I can add you to the group.

Thank you again for purchasing our books.

Good luck at National!

Yongcheng3315


yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #26 on: March 11, 2013, 07:14:56 AM »
from:    BR <[email protected]>
to:    [email protected]
date:    Mon, Mar 11, 2013 at 1:33 AM
subject:    Thank you!

Hi, yongcheng3315:

My son took your MathCounts 50 lectures and AMC 50 lectures over the
last two summers, together with some other online and local classes,
and he has made significant improvements in his math skills. His AMC10
scores this year was improved by 18 points higher and during the past
weekend, he took the state MathCounts and made into our state team for
the national contest. We were very happy for his achievements and want
to thank you for your great training programs for us. Our state coach
had started the training with the four students for the national
contest, and I hope he will do well at the national level.

Regards

BR
__________________________________________________________

from:    yongcheng3315 <[email protected]>
to:    BR <[email protected]>
date:    Mon, Mar 11, 2013 at 9:10 AM


Thank you very much for letting me know this great news!

Big congratulations to your son and you!

I am so happy for your son and your family!

Good luck at national!!!!

Yongcheng3315

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #27 on: March 26, 2013, 08:55:13 AM »
from:    DP <[email protected]>
to:    our mathcounts <[email protected]>
date:    Mon, Mar 25, 2013 at 9:01 AM
subject:    Update


Just an update.  We had our state math counts in Austin, and my son got x6 th place.  He is in 7 th grade..  He has one more year to give a good shot at it.  

To do that, I was wondering if you have any summer camp or equivalent for kids?  

Please let me know.  

Thanks

__________________________________________________________________________
from:    ourmathcounts <[email protected]>
to:    DP <[email protected]>
date:    Mon, Mar 25, 2013 at 6:55 PM
subject:    Re: Update

Thanks for letting me know.

Your child did a great job by ranking x6th in a big state that is very competitive as a 7th grader.

If he keeps working hard all the way through a whole year, I am sure he will improve a lot and have a great chance competing for the national team.

We are considering to do something in the coming summer and will let you know.

Thank s again for your trust and good luck to your son!

________________________________________________________________________
from:    DP <[email protected]>
to:    our mathcounts <[email protected]>
date:    Mon, Mar 25, 2013 at 8:03 PM
subject:    Re: Update

Thank you for the kind words. More importantly thank you for your support.

You would not believe how many times my son would look at your solution and say that is smart... You really have a neat way of dissecting the problem.

Kindly keep us in mind once you have formulated your plans for summer.

Thank you.
« Last Edit: March 26, 2013, 08:57:52 AM by yongcheng3315 »

yongcheng3315

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Westminister Math Team use 50 lectures as study books
« Reply #28 on: July 16, 2013, 12:19:50 PM »

yongcheng3315

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Re: 50 Matcounts lectures pdf files
« Reply #29 on: January 25, 2018, 02:22:01 PM »
回复:有人买过那个50 lectures for mathcounts 吗? 感觉怎样?
来源: 欢乐的爸爸 于 2014-02-26 12:42:49 [档案] [旧帖] [给我悄悄话] 本文已被阅读: 300 次 (464 bytes)
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回答: 有人买过那个50 lectures for mathcounts 吗? 感觉怎样? 由 tgifriday 于 2014-02-26 11:17:12

我家儿子的数学竞赛训练是从MC50讲开始的,之前只做Kumon。第一次接触MC50讲时有种惊为天书的感觉,原来竞赛训练还可以这样系统和深入,怪不得自己当年水平不高,没有这样的条件嘛。我们家用了两年的时间把MC50讲和AMC50讲都很仔细的攻下来了,受益非浅。现在回头看,觉得好的竞赛书其实有很多,不见得非选哪本书,重要的是学懂学透。我们在攻MC50讲时,着重的是学习作者的思想和技巧,至于发现书中的一些错误,倒觉得是自己的achievements,给永成发个mail 更正一下就是了,从没有什么反感的感觉 。

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