Number Sense Tricks // Video Tutorials

Well I know I’ve been talking about it for a while (and at one point settled on not doing them), but I finally decided to do something about providing video tutorials that are meant to accompany the material supplied by my Number Sense Manual. Here is a quick sample video (it was literally a single-take unrehearsed screen capture — the “real-deal” instructional videos will go a lot more smoothly):

My current screen capture set-up is:

If you have any suggestions on how to better screen capture, please leave a comment on this post (note: it will need to be Mac-compatible).

I plan on having the video broken up into two parts: instruction and examples — with a minimal amount of my handwriting as possible. The videos are planned to be less than 5 minutes long each and will follow, sequentially, with the sections in my Number Sense Manual. Eventually when I revise my manual again, at each section I will provide a hyperlink to its corresponding youtube video that will further aid in the trick’s explanation.

I hope to do two to three tricks a week. Also, if you e-mail me with a question on how to do a problem, I’ll either give you .pdf containing the step-by-step instructions or a brief video. So there you go!

50k Download Milestone!

Just wanted to let all the Number Sense enthusiasts who frequent this site know that you’ve surpassed the 50,000 download threshold! A year ago I couldn’t even imagine this type of activity on the website. I thought there might be some mild interest and maybe a few teams might like my Number Sense Manual, but WOW, 50,000 cumulative downloads of my material is something else!

Thank you all for making this project a success and I look forward to building off of it in the near-future!

Re-starting Number Sense Practice Tests

Just wanted to let avid readers of the website (particularly Mental Math enthusiasts) that I have re-started posting practice exams into their appropriate repositories. I plan on posting a new exam about once a week, so check back here often! Here are the links:

High School Practice Exams

Middle School Practice Exams

Updated Number Sense Manual (2018 Revision)

Number Sense Manual // Revision A

Happy to announce I’ve finally completed the revision to the Number Sense Tricks Manual I originally made a little over ten years ago. Here is the direct download link (you can also get it from my webpage here).

I cleaned up a lot of the LaTeX programming and split up each section into it’s own .tex file making it a lot easier to compile individual sections. I also made the .pdf a lot more navigable by adding referencing and a few hyperlinks to my free Middle and High School practice exams.  Additionally, I double-checked the question/answer pairing and corrected a fair number of problems. Finally, I added about two dozen more tricks that will help with 3rd and 4th column questions on more recent exams which you can find in Section 4 of the manual.

I wanted to get this version out ASAP to help students with their upcoming UIL regional/state meets. Over the summer, I plan on adding a substantial amount of practice problems to each section and doing another run through to make sure I didn’t miss any commonly tested topics. Hope this material is helpful to you!

Number Sense Manual // Update

Just wanted to let all the avid Number Sense participants know that I am (finally!) in the process of revising and editing my Number Sense Manual. I’m about halfway done with revamping the LaTeX code which, hopefully, makes it more readable (a lot has changed in 10 years!). Once I’m done with that I plan on adding a few more sections detailing the tricks that can be used to solve some of the more recent exam questions. I also want to expand the content to include popular Middle School tricks since there seems to be a lot of demand for that. I’m hoping to have an updated manual by the end of March – so stay tuned!

Number Sense Practice Tests // Update

First off, thanks to everyone that has made my Auto-Generated Number Sense Practice Tests (both for High School and Middle School) such a success!

In late July, A friend of mine added a better way to track the number of downloads of all the practice exams posted on my website. I’m very happy to report that there were just about 2,000 unique downloads in about a span of 9 weeks! Incredible! I’m very proud to say that I’ve played (albeit a small) part in fostering a love of math with so many students!

Just to give y’all a quick update of the status of the project:

  • There are about 11,000 question in the Middle School and about 8,000 questions in the High School databases. Collectively, that represents enough problems to total 225 exams!
  • Now that the databases are pretty robust, I’m going to concentrate on making column-specific drill sheets. Basically, they’ll be full 80-question tests that focus on just questions from Column 1, 2, 3, and 4 of the exam. That way, students can better stretch themselves practicing on questions that they are currently reaching within the time limit.
  • I’m also going to start making topic-specific drill sheets. This will pair nicely with the work I’ve already done with my Number Sense Manual as I’ll provide even more practice problems for each topic. For instance, if you want to learn how to multiply two numbers close to 100, I’ll have drill sheets specifically highlighting those types of questions.
  • I’ve decided against making videos of each individual topic for the time being. If you’re looking for better explanations of the tricks outside of my manual, I suggest going to Math Ninja’s Youtube Page as he has already made a ton of videos detailing how to do most of the tricks.

That’s about it! Good luck to all the students and teachers with their competitions during the 2017-2018 school year!

Middle School A+ / TMSCA Number Sense Auto-Generated Practice Tests

I’ve been very surprised (and pleased!) by the response of my Auto-Generated High School Number Sense practice exams — we’ve reached upwards of 3,000 total downloads since I began posting about them earlier this year!

As a result of their popularity, several individuals have asked me to produce something similar for the Middle School version of the exam. Since I recently reached my goal of 10,000 questions for my high school competition database, I decided to switch gears and focus on starting up a similar Middle School database. Over the past two weeks, I was able to generate 2,000 questions (sorted in the same way as the high school exam) and I’ve produced my first Auto-generated Exam and Answer Key (which you can download via the links).

I also created a Middle School repository where students can access all the number sense practice exams I generate for free. For the time being, I still intend to publish them on a weekly basis but will ultimately create a button where students can generate a practice test anytime they want a new one. I hope to have this implemented by the end of June — so stay tuned!

Number Sense Auto-Generated Practice Tests // Update

Without a doubt, the most trafficked part of this site is my auto-generated number sense practice tests, so I thought I’d give you an update on the project. Here is where we stand at the moment as well as some things I want to implement in the near- to mid-term:

  • The process is almost entirely automated now. The only human component is the transcribing from .pdf to LaTeX code. This should reduce the number of errors you see on practice tests as everything else — from segmenting out a test’s LaTeX code to adding the questions to the appropriate database to generating the practice test itself — is entirely automated and, hence, error free!
  • I have about 6,000 questions in my database. This equates to about 75 complete tests that have been translated in LaTeX code and are being used to generate the practice material.
  • I’m adding at a rate of about 500 questions per week. This means I should hit my goal of having a 10,000 question bank by the beginning of May.
  • As we approach the latter stages of the competition season, I will begin posting practice material more frequently on the repository page, so check back often.
  • I’m going to try to begin making a separate database of regional and state-level type of problems (harder difficulty, multiple steps in order to solve, etc…) in order to gear up for the more challenging exams. I should be able to begin posting that material by late-March.
  • I’m also going to start doing a series of youtube videos detailing step-by-step instructions on how to solve most types of questions asked on the exam. This should help out the more visual learners grasp the concepts.
  • Over the summer, I am going to revise my Number Sense Manual in order to update the LaTeX code, add more sections that are applicable to the current exams, and include much more practice material. Because the manual is sectioned off into types of problems (e.g. multiplying by 11, squaring tricks, roots of polynomials, etc…), students can focus more easily on a particular type of problem they are having difficulty with and do drills to really solidify their understanding.
  • Finally, beginning for the 2017-2018 school year, I’ll make it where students can generate their own practice exams through my website — thus eliminating their dependence on my posting on a weekly basis. You’ll be able to practice as much as you want, whenever you want!

BYU Math Contest + Number Sense Tests // Update

Received word back from the BYU Math Contest organizers that the problems I submitted a few weeks back made the cut and will be used in the problem pool for this years test!

In other news, I crossed the 3,000 question threshold for my automated Number Sense Tests which will mean less test-to-test repetition. My goal is to get a bank of 10,000 questions before I begin work on having user-generated exams via the website so students aren’t beholden to my weekly posts.

Anyways, 2017 is off to a great start!

UIL / TMSCA Auto-Generated Number Sense Test 2 // Future Work

The question pool that my auto-generated Number Sense test relies on has swelled to 1200 questions and is growing at a rate of about 500 questions per week. There might be some weird artifacts — like two Roman Numeral questions or three integral questions within the same exam — but these are attributable to fact that you are randomly selecting problems from the pool and is not indicative of some problem with the program. As a whole, I’d say I am about 90-95% accurate in replicating a competition exam.

Here is the second exam and its answer key. As always, you can find all the practice exams from my repository here.

Currently, the difficultly in the auto-generated tests are comparable to UIL Invitational through District exams. I plan on, separately, creating harder practice tests that replicate Regional and State competitions for those who want more advanced practice. (I didn’t want to discourage novice competitors by incorporating very challenging problems into the question pool that could be randomly incorporated into the practice tests).

As this project moves into the “auto-pilot” phase, I’ve been thinking about what I want to do next. One topic I am very passionate about is personal finance and the journey towards Financial Independence (or more commonly know as FI). One thing that has been helpful to both myself and my friends is a more “real-world” mortgage amortization table that I created which aids a future-homeowner with their decision of finding the right house to buy and the type of loan to buy it with. I’m beginning work on developing python code to generate this table from basic loan/house information as well as output helpful statistics (e.g. the amount of time where a 15-year loan is preferred to a 30-year, assuming a particular market return, etc…).