5 skill sheets covering Metric system mass conversions (i.e. kg --> cg) with 10 unique questions each. (50 unique problems). Problems include all the standard conversions including kilo,hecto,deka,unit,deci,centi,milli units. Each version has scrambled questions, answers, names, objects, and number values. I prefer having multiple versions for extra credit/ practice, redos and even to aid in assignment integrity. A key is included. The more versions the better!