As a young engineering student I had to come up with ways to shorten my work during a time calculators were still mostly unheard of. This was the result. Looking at the relationships between numbers and their equivalents in order to multiply in simple manageable ways lends to the feeling of accomplishment and power over numbers. These techniques are not found in textbooks and are unique applications of known math facts. They are useful from day to day and often free one from depending on a calc