Even and Odd Numbers Even numbers are the numbers of sharing jelly beans among two friends. You make sure that they are split evenly, grabbing two at a time and dropping one in each bowl. This is what it means for a number to be even. If you placed both bowls on the opposite ends of an old-fashioned scale, then they would balance. That is unless you accidentally drop an extra jelly bean in your own bowl, tipping the scales so to speak in your favor; then you have an odd number of jelly beans.  This is what it means for a number to be odd. The first five even numbers are 0, 2, 4, 6, and 8. The first five odd numbers are 1, 3, 5, 7, and 9. As martian mathematics is largely single digit in nature, these are the only ones that matter here. It is a happy coincidence that the evenness or oddness of a number—called parity—is betrayed by the ones' place value of the number in question  (I will show why this is in a later post) : 332 is even, while 241 is odd.  Kno...