This is the 6th post in the Divisibility Rules Series. In this post, we discuss divisibility by 7. Simple steps are needed to check if a number is divisible by 7. First, multiply the rightmost (unit) digit by 2, and then subtract the product from the remaining digits. If the difference is divisible by 7, […]

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# Monthly Archives: February 2012

## New Archive Page, Language Translation, and more

Hi everyone. Here are some few updates and announcements: Due to the growing number of posts, I have created an archive page where the complete list of posts are arranged by month. If you want to view the posts by category, you can go to the Mathematics, Multimedia, and GeoGebra pages. You can also visit the […]

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## GeoGebra Tutorial 33 – Lunes and Layers

This is the 33rd tutorial of the GeoGebra Intermediate Tutorial Series. If this is your first time to use GeoGebra, I strongly suggest that you read the GeoGebra Essentials Series. In this tutorial, we are going to draw the figure below, the Lunes of Hippocrates. Although it looks like a simple drawing, it requires the knowledge of layers […]

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