Prerequisite: How to move programs to your TI84 Calculator The programs below are written in TIBASIC, which can be transferred from your computer to your TI84. You will need two items:
• A USB cable, Type A male to Type B Mini male 

FACTOR.zip A tiny program that does one thing: factor numbers. Put in any number greater than 2, and it will return all factors. If the number is prime, the program will return the message it is a prime number.  
QuadProf202.zip
Quadratic Professor, version 202. Replaces Quadratic Theta, an earlier version. This program is great for checking your work. It takes three numbers, the coefficients of a quadratic expression in the form of Instructions.docx  
transprof.zip Transformations Professor. The program can do rotations, dilations, reflections, translations. It takes a shape (you enter the x,y points) and from there you can do transformations! Includes an easy "demo" shape to get you started. Fun features include any degree rotation, and any line defined by slope and y intercept. Zip file includes the app file for your calculator and a short instruction sheet.  
statprof.zip Statistics Professor. The program can do single variable calculations, binomial probability, zscores and percentiles, normal distributions and curves. It has a random data maker (very handy!) and will handle Inferential Statistics.
 
RADICAL.zip Radical. It does one thing: takes a radical number, like √128, and expresses it in simplest exact form, 8√2. Included is a version that works on the older TI84 Plus models.  
LISTPRIME.zip List Primes. It does one thing: Take any number n, and lists all the primes from 2 to n. It will store the results into builtin list, L_{1}. See graphic on the left. 