It has been awhile since I've written a post here. It has been a busy year with teaching, family, and a big project. My wife has kept up recording the interesting family events.

For the first time in all my years of teaching, this semester I have a TA. Billy is a great teaching assistant. For the benefit of teachers and students who still use the TI-84 Plus (he and I enjoy the TI-Nspire CAS handheld and software) he has grabbed a bunch of screen shots for the new operating system using TI-Connect . Several wildly popular features that have been native to the TI-Nspire for the past 3 years, have now made their way on to the 84. On the TI-89 that I used to teach calculus with, there was what was referred to as "Pretty Print" on the output. You would enter an expression with weird syntax and many parentheses, but you could check that you entered what you wanted once you were finished.

The new operating system OS 2.53 MP [update: On January 10, 2011 OS2.55MP came out] brings the feature of MathPrint (TM) to the 84. Students will make fewer mistakes on homework and those important end-of-the-year exams, because what they enter looks like what is in the textbook or their homework paper. Students tend to enter calculations one step at a time and then they don't know where they went wrong. If they want to do a complicated calculation they would do well to enter it on their handheld technology - whether it be a TI-84 or Nspire - the way that it looks on their paper. Another new feature is, instead of pressing 2nd ENTER to review the last 10 entries, they can now arrow up around 30 entries. If they press enter on the selected number or calculation, this will be copied down so it can be edited or reused.The above screen shows some calculations that my students have done in the past. The first is to find the acceleration of a penny that is 18 cm from the center of a record that is spinning at 33 1/3 rpm. Notice that this is highlighted. If I press enter, then I could easily change it to be 45 rpm, or I could change it to a penny that is closer in (since vinyl albums actually have a radius a bit smaller than 18cm) . I love that the square root radically (pun intended) goes over everything that it is supposed to. The second calculation shows the amount of time it takes if I take that penny and drop it off the roof of our school 5.2 m above the ground. It is easy enough to change it and see how long it would take, ignoring air resistance, if this was dropped from the top of the Burj Dubai (828m), or we could change the 9.8m/s^2 to the acceleration of gravity on another planet.

Calculus teachers will particularly enjoy MathPrint because they won't need to spend the time teaching an unusual syntax like d(e^3x,x,5). Derivative at a point uses Leibniz's notation and the 'such that' vertical bar followed by the point for the derivative to be numerically evaluated. The definite integral is another example of MathPrint making the entering of a calculation more intuitive. Here are a series of screen shots that demonstrate an effective way to find the intersection, area between curves, and volume by rotation. Notice that MathPrint is supported in Y=.

Besides using the shortcut, of which there is a reminder every time the 84 is turned on, many of the features can be accessed through the MATH button, or MATH then NUM. If for some reason users preferred the classic view, there is now a second screen under MODE were MathPrint can be unselected. Also note that if mixed fractions are preferred they can be chosen. (Hey, fractions are now supported in the tables, lists, matrices, and window zoom.) I like that there is a central location for Stat Diagnostics to be turned on and another way to get to the Graph Screen Formatting.

All of the current apps (that I know of) are unaffected and still work except for Catalog Help. Be sure to download and install this using TI-Connect. The new OS 2.53MP is available under downloads at education.ti.com.

Teachers will want to put these on their TI-84 SmartView emulator so that what they do in front of the class matches what the students see. This is done by pressing File>Load File ... (as show on the left) then just find the OS (pay attention to where you save what you download). You don't want to throw away those silver cables. These come in handy for using the CBR with the 84 SmartView. However you won't need it to update the OS when using the TI-84 faceplate on the TI-Nspire. Updating the Nspire will automatically update the 84 mode.

These pleasant new features are not available on the TI-83. Again, to update the TI-Nspire that is in 84 mode, all you need to do is update the TI-Nspire (which leads us to believe that a new Nspire OS will be coming soon).

Stay tuned for all the impressive new features for the TI-Nspire & TI-Nspire CAS that make that device even more intuitive for new users. Current users will enjoy how their requests have been listened to in many ways. These educational tools really have continued to improve to meet the needs to teachers and students.

Lord, may how we teach and the tools we use

be filled with a beauty of design

that reflects the Creator of the universe

and the image of Him in whom we've been made (Gen 5:1).

May we use technology more effectively for the improved education of students.

be filled with a beauty of design

that reflects the Creator of the universe

and the image of Him in whom we've been made (Gen 5:1).

May we use technology more effectively for the improved education of students.

## 4 comments:

Thanks for the info and screenshots! This will be a big help for my Precalc and Calc students!!!

Thank you for taking the time to do this. I had explored it a little bit, but had not discovered quite how slick it was until I read your entry.

So happy that you never have to do change of base for logarithms ever again!

nice write up. do you by chance know if 2.55 allows complex numbers to be converted to fractions as easily as it could be done pre2.53?

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