See also the Dr. Math FAQ: 3D and higher Browse Elementary
Number Sense/About Numbers Stars indicate particularly
interesting answers or good places to begin browsing. Selected
answers to common questions: Multiplying by zero. Casting out
nines. Number facts from the Web. - Hexadecimal Division and
Addition [07/06/2003] Could you provide a few examples of how to
solve hexadecimal addition and division problems? - The Highest
Exponent [10/23/1995] What is the highest exponent ever known? -
History of Numerals and Counting: Bibliography [11/18/1996]
Where do I find information on different systems of
measurements? - History of Writing Decimals and Number Lines
[10/28/1998] Why, on a number line, are the negative numbers are
on the left? When you deal with decimals, why are the whole
numbers are on the left? - 'Honest' Numbers [11/11/2002] My
teacher asked the class: What is the only 'honest' number? - How
Does This Multiplication Method Work? [11/12/2003] I've just
learned a new way to multiply, where all you h