National Council of Teachers of Mathematics
The Math Forum: Calculation Tips & Tricks: Multiplication Tips
Find tips for multiplying by 5, 9, and 11, and learn how to solve math problems without a calculator. This site includes explanations and examples for gifted children and teachers wanting to challenge their students.
Math Is Fun
Math Is Fun: Multiplication Tips and Tricks
Great tips and tricks to help you learn to multiply by 2, 5, 6, 9, 10, 11, and 12. Also, learn why remembering your squares can help you multiply.
National Council of Teachers of Mathematics
The Math Forum: Lattice Multiplication
Great web site that offers a detailed summary of how to multiply using the lattice multiplication method.