Too ambitious as a WarmUp for the 6th or 7th grader? Would they immediately employ the "Make it simpler and look for a pattern" strategy? Is the calculator appropriate for this activity? Is this really an activity/investigation?
Since I'm already regarded as an anachronism, I guess it wouldn't hurt to play word games here:
Hey, there's a whole generation (or more) who may have no idea what that means! If you do know, you can always say you heard about it from your great-grandfather who carried around his slide rule! Hey, anyone have their Keuffel & Esser handy?