




Properties of Logarithmic Functions  Logarithms as Inverses of Exponentials
Each topic includes lecture notes with an interactive demonstration, a video, and testing content.


How to Teach with these Materials

Motivation 

From approximately 1614 to 1972 (the time of John Napier to the release of the first HP calculator) engineers, mathematicians, navigators, and anybody else required to perform more than simple arithmetic would have relied on logarithms, and more often than not a slide rule, to simplify calculations. You may have seen a slide rule before: the simplest consist of two fixed outer bars, a free inner bar, and a cursor. By sliding the inner bar and the cursor and observing what numbers aligned, it was possible to multiply and divide large numbers, as well as find squares and square roots. Today even a dollar store calculator is many orders of magnitude faster and more accurate than a slide rule, but it may still be true that the use of a slide rule gives you a better understanding of the numbers and calculations you're performing.










