Open Number Line for Subtraction
Video example: http://learnzillion.com/lessons/1583-solve-subtraction-problems-using-a-number-line
Subtract three digit numbers using expanded form
This video takes you through how to expand a number into each place value to help you subtract.
http://learnzillion.com/lessons/3002-subtract-threedigit-numbers-using-expanded-form
Subtraction using a number line
This video shows how to “jump back” to find your answer.