How do I adjust a set of numbers?

… part of a demo requires the user to change some figures, example: 010.0 to 020.0 by using a set of four buttons - two have to control the increase or decrease in single number increments - the other two control the left and right movements to change the units… I’m not sure where to begin to recreate the functions above as I am not very good with actionscripting but I do try, so pointing me in a direction of a tutorial that may help me understand what i’m trying to achieve would be very helpful. Thank you.