Here are some tips and tricks for

Easier Multiplication:

http://catdumps.blogspot.com/2008/12/multiplication-easier.html

Numbers with same first digits:

http://catdumps.blogspot.com/2008/12/multiply-two-numbers-with-same-first.html

squares of numbers:

http://catdumps.blogspot.com/2008/12/to-find-squares-of-numbers-near-numbers.html

squares of numbers from 50 to 59:

http://catdumps.blogspot.com/2008/12/to-find-squares-of-numbers-from-50-to.html

Multiplying by thirteen:

http://catdumps.blogspot.com/2008/12/multiplying-by-thirteen.html

Easier Multiplication:

http://catdumps.blogspot.com/2008/12/multiplication-easier.html

Numbers with same first digits:

http://catdumps.blogspot.com/2008/12/multiply-two-numbers-with-same-first.html

squares of numbers:

http://catdumps.blogspot.com/2008/12/to-find-squares-of-numbers-near-numbers.html

squares of numbers from 50 to 59:

http://catdumps.blogspot.com/2008/12/to-find-squares-of-numbers-from-50-to.html

Multiplying by thirteen:

http://catdumps.blogspot.com/2008/12/multiplying-by-thirteen.html