Arthur Nunes-Harwitt's Essays on Elementary Mathematics

Here is a collection of essays I've written on topics in mathematics. The first essay has to do with the relationship between a number and the sum of its digits. The second is on the Fibonacci numbers. The third is a work in progress on calculus. (Other essays are on their way.)

A detailed answer to the question, "Why is it that if the sum of the digits of a number is divisible by three, then the number itself is divisible by three?" pdf
A student in an algebra course I was teaching asked me about the Fibonacci numbers. pdf
A work in progress to help students understand calculus. pdf

To tell me if you liked one of these essays, click here.