Eddie's Math and Calculator Blog

HP 12C and HP 41C/DM41L:  Rounding Numbers Introduction The following program rounds positive numbers to the desired decimal amount of ...

Casio fx-CG 50:  Impedance Calculations Introduction The program FX61IMP contains a suite of impedance calculations.  Why the unusu...

HP 12C:  Finding Two Factors of an Integer  Introduction This program finds two factors of the integer N, where one of the factors ...

HP 12C:  Total Sales Tax with Rounded Amounts Introduction The following program calculates the total invoice with the total sales...

Casio fx-991EX Classwiz:  Simple Programming With Mutli-Statements  Formula Programming With the use of the [CALC] key and multi-statme...

HP Prime: Law of Refraction  Introduction The program DRAWREFRACT, visually demonstrates the Law of Refraction, or Snell's Law: n...

HP 41C/DM 41:  Halloween and Thanksgiving - Calendar Calculations Introduction  We are about to enter the annual holiday season, an...

Fun with the TI-81:  Part II Please check out yesterday's blog entry for Part I.  Now let's continue. TI-81 Decimal to Fraction...

Fun with the TI-81:  Part I Before there there was the TI-82, TI-83 and its family, and the TI-84 Plus and its family, there was the Texa...

HP 42S/DM42:  Error Function, Bernoulli Numbers, Chebyshev Polynomials Error Function The program ERF calculates the error function: ...