In this episode we learn how to rapidly multiply any 2-digit numbers together using the method of criss-cross multiplication.

Episode Summary In this episode, we learn the very powerful method of criss cross multiplication. This allows us to rapidly multiply any 2-digit numbers together completely in your head. Some multiplication tricks only apply to specific cases but this method applies to any multiplication between two numbers that each have two digits, such as 34 times 44, for instance.

This mental multiplication technique centers around multiplying in a criss-cross format and mentally carrying digits as needed. When the need arises to do mental multiplication without the aid of paper, this technique is superior to what is taught traditionally in school.