Doubling is ×2 Before we begin, I would like you to try your hand at the following multiplication problem (in your head): 2  × 734829.  If you would like to be able to multiply this as easily as reading of the digits, then read on.  We are all familiar with doubling. If you have  N  items in a bag and you double it, then it is like adding a second identical bag so that now we have twice as many as we did before ( 2N ).  In martian mathematics you need to know the following doubles: What about the numbers 5-9? We will get to that in a moment, but first let's take what we have out for a ride.  If we want to double a number of any size then we just read it from left-to-right one digit at a time, doubling as we go. Easy, huh? Now let's tackle the other five doubles you need to know. For the most part, martian math is a single-digit technique and we can ignore anything not in the ones' place. For this reason, when we double a number great...