Cut the Knot
Cut the Knot: Lattice Multiplication
Have you heard of the 13th century mathematician, Leondardo Fibonacci? See examples of his concept of a lattice multiplication algorithm. Several example problems, including an interactive one where students can change the factors, are...
Other
Who Was Fibonacci?: Roman Numerals
Gives a short introduction to Roman numerals. Explains how to add, subtract, and multiply Roman numerals.