One of the interesting app I’ve came across recently is Google’s AR Measure App. This app allows you to use your phone camera to pick two points in the real world and get the distance between them. You can use either imperial or metric units in measurement. In addition, you can also save photos for later measurements. For approximating the height of a cabinet or the length of the table, this app can come in handy. And from experience, it’s quite accurate. I tried to measure my Macbook Pro and I was only 1 centimeter off.

Although I have already tried the app in measuring short lengths, I would like to try measuring long ones. I think this can be very useful in teaching trigonometry and trigonometry. For example, we can make students solve for trigonometry problems and then use the app to check if their answer is correct. That is, of course, assuming that the app is accurate at measuring long distances.

Google AR Measure is available for free in Google Play for Android phones that support Google’s ARCore platform. There is an interesting competition though. Apple has the same app which has the same name.

Editing of Old Articles

Mathematics and Multimedia has been silent for the past four months because I am busy, but I have silently edited old articles. I will continue editing and one of the improvements that I am planning is to integrate GeoGebra applets in some of the articles since GeoGebra can now be directly embedded in WordPress posts. As many of you already know, I have numerous tutorials on how to use GeoGebra. In addition, I am also updating the tutorials using the current version of GeoGebra. There are many new developments particularly the integration of augmented reality.

I started this blog 9 years ago and, so far, I have written more than 1000 articles. Many of them are on using GeoGebra and many also contains discussion about mathematics content from elementary school to university mathematics. Numerous times, I have also introduced apps that can be used for teaching and learning mathematics. The complete list of all the posts can be found in the Archives page.

Starting today, I will be sharing more about mathematics teaching and mathematics ago. I had been hesitant to share my thoughts about them because I felt that I was not qualified to do so. Recently, I have realized that maybe, there are a few things that I can share from more than one and a half decades of teaching and training. Hopefully, this blog will be of help to younger teachers or at the very least a trigger for reflection and discussion.

Understanding the Meaning of Absolute Value

One important concept in algebra that we learn is the distance between two points on the number line. In particular, we study the distance of a point that corresponds to a number to the point that corresponds to 0. In the following figure, the point (or circle) on the left represents 0, while the point on the right represents 5. To simplify our language, we will use coordinates to refer to its corresponding point on the number line. For instance, we will use -8 to refer to the point that corresponds to -8.

Looking at the number line, it is easy to see that 5 is 5 units away from 0 and that -8 is 8 units away from 0. We can also see that 0 is 0 units away from 0. The distance of a number from 0 on the number line is called its absolute value. Hence, the absolute value of 5 is equal to 5, the absolute value of -8 is equal to 8, and the absolute value of 0 is equal to 0. » Read more

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