Math Word Problems: Solving Age Problems Part 1

This is the second topic in the Word Problems Series. In this series of posts, we are going to discuss age problems.  In age problems, most times, ages of persons at different points in time — past, present, and future — are asked about.

One of the most famous age problems in the history of mathematics is Diohpantus’ Riddle. After this series, you should be able to provide a solution to Diophatus’ age problem. 🙂

As we have done in the previous topic, we will start with simple problems. As we go on, the problems become more complicated.  Let us start with the first problem.


Adrian’s age is one less than twice Carlo’s age. The sum of their ages is 50. What are their ages?


As you have probably noticed that this problem is very similar to the problems we discussed earlier.  Age problems just like most algebra problems which are number problems in disguise.  » Read more

UP NISMED’s New Sites About Mathematics and Science Teaching

We at the University of the Philippines National Institute for Science and Mathematics Education Development (UP NISMED) are currently developing several websites on mathematics and science teaching. AgIMat is one of our newest sites,  a public service of UP NISMED’s staff for K-12 science and mathematics teaching. AgIMat stands for Agham (Science) Impormasyon (Information), at Matematika (Mathematics) is a resource dedicated to Filipino teachers.

agimat mathematics

Some of the materials posted on the site have been used in classes or in professional development for teachers. The materials are written in English,  but some are written in Filipino. We are also planning to have materials in other native languages in the future. » Read more

GeoGebra 4.2 Sneak Peek 1: The GeoGebra Window

The GeoGebra 4.2 will be released very soon, so here is another Sneak Peek Series about the new version. In GeoGebra 4.2 Sneak Peek Series, we are going to “take a peek” at the changes made and the new features of GeoGebra.  In this post, we examine the changes of GeoGebra’s Graphical User Interface (GUI), particularly the GeoGebra window as shown in the first figure.

GeoGebra 4.2

In the figure above, the smaller window is GeoGebra 4.0  and the  larger window is GeoGebra 4.2. Release Candidate. The first thing that you will notice in GeoGebra 4.2 Beta is that the Perspectives menu on the Menu bar was transferred to the Sidebar on the right side of the Graphics view.  This menu can be shown or hidden using the arrow on its center-right of the Sidebar. » Read more

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