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...
Cool Math
Coolmath: Coolmath4kids: Lattice Multiplication
Demonstrates step by step how to use the lattice method for multiplying numbers.