## TI introduces new color-display TI-Nspire CX

TI has a new color CAS (computer algebra system) handheld learning device!

From the Press Release:

DALLAS, Feb. 25, 2011 /PRNewswire/ -- In its quest to support math and science educators in achieving learning goals for their students, Texas Instruments rolls out its Nspired Learning solution with the introduction of the new color-display TI-Nspire™ CX handheld. With the Nspired Learning solution, teachers are able to build their own interactive and engaging math and science classrooms.

The TI-Nspire CX handheld is the cornerstone of the Nspired Learning solution. The TI-Nspire CX handheld offers a set of fully integrated tools that allow dynamic links among multiple representations of a problem. The color display enables students to better observe patterns and make connections between math and science concepts and real-world learning. With the TI-Nspire CX and TI-Nspire CAS handhelds' new 3D graphing capabilities, students can explore concepts from multiple points of view to develop deeper conceptual understanding.

More.

## A very clever calculator

Below is an image from Wikipedia of a calculating device invented in 1891, Genaille's rods. Each column in the image is a rod that can be placed wherever it's needed in a calculation.

The image shows how to easily calculate 52749x4.

Can you figure out how this arithmetic tool works?

Making a set of these rods would be a great enrichment project. Here is a template (in different sizes) that you or your children or students can print and mount onto cardstock to make your own set. You'll want to make a number of each of the rods so that you can multiply by numbers where one or more digits occurs more than once.