Thursday, February 13, 2014

Musings of a Nadjling!

As we were driving back home from his percussion lesson, Omar (the 12-year old Nadjling) said, "Baba, future does not exist." 

"How so?" I replied. 

He said, "Well, future is not here, it is unknown, and when it occurs it is present. So, there is only past and present." 

This took me by complete surprise and I retorted, "This is an interesting thought and I would have to think about it."

Then, the math connection came when he continued, "The future is undefined and when it is experienced it is not a future; it is the present then." The Physicist in me could not help but think of contrast between the deterministic interpretation of the world by classical Physics versus the quantum mechanical probabilistic approach to physical phenomena. In addition, I thought of the wave function collapse from a "nebulous/combined state" to a definite state once one performs an experiment with elementary particles.

For a kid to hit on an idea such as this is fascinating. So, I encouraged him to jot down such things when he thinks of them in the future.

Afterwards I gave Omar the example of how knowing the current position, velocity, and acceleration of a probe we are sending to Pluto for instance, we can predict its future position, velocity, and acceleration and this is how we are able to get such probes that far and with incredible precision. I was trying to convey the idea of the deterministic nature of classical Physics. 

But, before I went far with the idea, he interjected by mentioning the take-home test that he mentioned earlier in our trip and he was going to take when we get back home and said, "I am going to cheat." Alarmed by unethical behavior I was going to start giving him a big lecture but he interrupted by explaining, "I have to do a decay experiment and instead of taking out sixes of dice, I will just take out evens." I said, "Why would you do that?" He replied, "This way the decay rate will be a half." To this I commented, "This is not cheating; this is clever! But, why take out the evens and not the odds?" To which he answered, "Evens have only one prime number." Ok!

Fast forward and Omar is at home. He thought he had 100 dice (the required starting number given in the test directions) around the house but he found only 49. So, he shared with me the following thought, "Would it be ok to just use 49 and whatever I get I divide by 49 and multiply by 100 to make the experiment match a 100-dice roll?" This being a test, I told him that would have to be his decision. Deep inside, the father in me could not help but feel proud of the kid's divergent thinking and resourcefulness. In the end he decided to keep the experiment simple, straightforward, and he used 100 coins.


Omar is lucky that his father knows about math and is willing to give-and-take with him in such musings and I just hope that the many Omars out there would be equally fortunate and benefit from such exchanges with adults (teachers, parents, older siblings, etc.) around them. So, if we (the math/science teachers) are the only adults that kids may get this mental gymnastics opportunity from we must seize it with earnest passion and great patience for it would help them grow as thinkers and flourish as math/science lovers.

Happy Valentines Day & please share musings of your students or your own kids in the comments section.

Thank you and take great care! :-)

Wednesday, February 5, 2014

Sinusoid Lab Activities

Nothing helps students get a good handle on mathematical concepts than lab activities that addresses the subtleties and true meaning of the underlying components that accompany such concepts.

Following is a description of a set of lab activities that deal with the sinusoid and its usefulness in trig and in many real life situations that are periodic in nature. 

Day 1: Students were handed a plot, that I obtained in an experiment I conducted as a test run (see still image of video shown below), to model it themselves using the sinusoid (transformed basic sine function) involving the h & k form. First the students had to work alone, then with a partner, and then in a group to assist one another with the modeling process.
Test Run by Mr. Le Nadj! of the Lab the students are about to conduct themselves!

Day 2: Students were handed a data set to enter the first two columns in their respective TI calculators and as a class we worked together to plot the data, model them ourselves as a class, and then the class was broken into three groups whose assignment was to carry out the same process but for columns one and three, one and four, and one and five respectively. The rest of the work consisted of students competing for the best fit equation generated by hand and the group member with the equation that fit the best than her/his group peers will be treated to delicious sweets. No TI sine regression was allowed.

Day 3: Students's regression equations were pitted against one another for each group and the best fit equations were identified and the equations owners were treated to double sweets while the rest of the folks (who did attempt a decent fit of some sort) got single sweets. Afterwards, the sine regression functionality in the TI calculator was introduced and now the students were ready to carry out the lab activities themselves. The setups, the procedures, and all technology matters were introduced. Following, are the pictures of the various setups.
First Setup: The pendulum is facing the motion detector that is resting on a make-shift bubble gum box. The students in this group will alternate in collecting data onto their respective laptops. From the camera perspective, another group is going to use LoggerPro's video capture of the same motions of the pendulum (see picture below.)
Second Setup: The pendulum motion is recorded laterally by the members of another group using LoggerPro's video capture of the same motions of the pendulum that the first group is recording. The idea here is to allow for cross referencing and checking of the various group members' data and results.
Third Setup: An iPad is hanging as a bob from a spring that is attached to a force probe. The oscillatory motion is recorded in two ways, the acceleration of the iPad using SPARKvue app from within the iPad itself (see next pictures) and force using Vernier's dual force probe whose results are fed directly to LoggerPro of the students' laptops. Once again the idea here is to allow for cross referencing and checking of the various group members' data and results using two different means of gathering data related to the same motion.

Day 4: Students did the actual lab; the scene was lively, the graphs were gems (an example is shown below), and the thinking and enthusiasm were Coolism! 
The graph of the oscillatory motion of the iPad shows three parts, the hand picking the iPad to start the recording of the motion, the oscillation, and final the hand picking the iPad again to stop recording the motion.

Once the data collection process was completed and every student obtained her/his data and graphs on their respective laptops, the task of switching LoggerPro's form to theform. This part ended up being the homework that was due next day; every student had to complete the form change and make the predictions requested in parts B, C, & D listed in the lab sheet (shown at the end of this post).

Day 5: Students showed their form changes and their predictions, compared their respective constants, and then discussed their predictions and how they would be checked empirically.

As a whole the activity was not just fun but also led to many insights. The experiment is still in progress in that a followup lab that will make the oscillations dampened shall ensue when exponential functions come into the picture.

Thank you for reading the post and please provide some feedback, suggestions, or variations you deem worth consideration. 

Thank you and take great care! :-) 

Hand Outs:




Tuesday, November 26, 2013

Use of QRs in Math Class to add a bit of Fun

My schedule has been very hectic as of late; busy taking MOOCs and taking care of school work.

The current MOOC that I am taking through coursera is "Emerging Trends & Technologies in the Virtual K-12 Classroom". The topic of using QRs came up and I recalled that two years ago I prepared a little game a la scavenger hunt to help my students review for the Precalculus test. 

Following is a brief description of the said activity:

1) I used classtools.com (I strongly recommend this cool site; Coolism!) to generate the scavenger hunt for this activity. The site guides you through the whole process.

2) I entered my five questions, generated the corresponding QR codes (try them out by pointing your own mobil device that has a QR reader), printed them, cut them up, and then posted them around the building in conspicuous places that the students will have to find. 

3) The students were split into groups and the adventure started.

4) The five questions were appropriate for the 50-minute class. The group that completes all solution processes first and correctly got sweets.

5) The session was fun as the students attested and they got a bit of a review.

QR Code of Question 1


QR Code of Question 2


QR Code of Question 3


QR Code of Question 4


QR Code of Question 5


6) These are just a few examples of how such a technology may be used. Adding games and fun to any learning activity is a big plus.

Please, reply to this post and make sure you add your own game and fun-filled activities in the comments area. Thank you 











Friday, October 11, 2013

MTBoS Mission #1 Blog Post: Clickerisms & Conceptual Understanding of Mathematical Ideas

This blog is my contribution to the Explore MTBoS Mission #1 [The Power of The Blog] initiative by our good fellow math bloggers Tina Cardone (@crstn85), Julie Reulbach (@jreulbach), Justin Lanier (@j_lanier), and Sam Shah (@samjshah).




Specifically, this blog addresses "What is one thing that happens in your classroom that makes it distinctly yours? It can be something you do that is unique in your school… It can be something more amorphous… However you want to interpret the question! Whatever!" of Mission #1 as stated by Sam.

Clickerisms! Using a set of clickers (class response systems as some folks would call them and they are shown below), I have always challenged my students with conceptual questions that would enable them and me gauge their deep understanding of mathematical concepts. The process goes as follows.


* Clickerisms as Unit Starters: My students are required to read a given section/chapter prior to start of coverage and a set of of true/false questions are presented to gauge students' understanding of what they read. Following are examples of such questions that precede a unit on number sets for more questions (check #precalcchat posts where I put sample questions from trig.)

*** Start of 1st Clickerism Set ***

1.  Answer True or False. The sum of two irrational numbers is always irrational.
A)  True
B)  False
2.  Answer True or False. The sum of any irrational number with any rational number is always irrational.
A)  True
B)  False
3.  Answer True or False. The division of an irrational number and a non-zero rational number is irrational.
A)  True
B)  False
4.  Answer True or False. The square of an irrational number is always rational.
A)  True
B)  False


*** End of 1st Clickerism Set ***


Students work on these problems individually at first, commit their answers to the output area of their respective interactive notebooks (INB), then a rapid fire sequence of clicking of answer choices would follow to obtain a set of bar graphs that would show the distributions of students' answers to each of the questions. Students are then asked to discuss the questions, that had no consensus class-wide, with someone who answered differently than they did. An updating of students answers would ensue. If the new distributions reflect a consensus, then the said questions would be skipped for now and the rest of the questions would become a springboard for delving into the topics at hand in greater depth by me.

** Clickerisms as Lesson Pulse Checkers: After the above process is completed, new activities would start to guide the students' learning process of the related concepts. But, before the lessons are considered done, a new set of Clickerisms is presented to check how well the concepts that were investigated earlier are well understood. These Clickerisms are more like mini quizzes that are generally extracted from whichever textbook I use for the given class or I generate them from encounters with Mathematical Blasphemies (MB) in previous years. Since, I use Axler's Precalculus textbook, here is an example of such a Clickerism as it appears in one of my PowerPoint slides that relates to the same topic mentioned above. Notice the three follow up questions that include a final question that sometimes I have students click anonymously to help me gauge their feeling about their level of confidence in understanding the underlying concepts of the questions at hand, the processes that went in completing them, and the final outcomes. 

*** Start of Clickerism ***




*** End of Clickerism  ***



The Clickerisms are a consistent set of formative assessment tools that I use to ensure students' deeper grasp of mathematical ideas they have read about and then have worked on in class. 

Thank you for taking the time to read this blog entry and I hope it would provide you with a possible way of increasing your students' confidence in what they learned and your confidence in their deeper conceptual grounding in mathematical understanding. Please, comment and add suggestions that would improve my teaching and my students' learning.  



  

Friday, October 4, 2013

When Trig Meets Series and Sequences

Combining the ingenuity of one of the problems posted by Maths Challenge site, "Corner Circle" and the versatility of Desmos this problem led to further neat sub problems that end up connecting trigonometry to topics of series and sequences. Below is the link the investigation "Mr. Le Nadj! Desmoses "Corner Circle" Problem.


Please, give this activity a whirl in your class and report back as to how it goes for your students. Thank you

Wednesday, September 11, 2013

Updated Unit Circle Investigation in Desmos

Once my students worked on Unit Circle Investigation 2, new cool things emerged that I decided to add to the first two investigations and committed them to Unit Circle Investigation 3 within Desmos. Please, check out this new investigation and provide feedback and how did it work for your students? Thank you



Sunday, September 1, 2013

Unit Circle Desmos Investigations

I have just posted two Unit Circle investigations at desmos.com, Unit Circle Investigation 1 & Unit Circle Investigation 2.

Please, take them for a spin, assess their educational value, and then post some feedback in the comments area. If you use these with your students report back regarding its success or lack thereof. Thank you