Step 1. Count the number of zeros in 10, 100, 1000, etc.
Step 2. Add a the same # of zeros to the number you are multiplying.
For example,
added 1 zero to 5
added 2 zeros to 5
added 2 zeros to 50
added 3 zeros to 5
added 3 zeros to 50
I hope the above steps were helpful.
For Step-By-Step free videos in Introduction to Algebra, please visit
http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit
http://www.FreedomUniversity.TV/courses/Trigonometry.