Materials Materials for Activity 1: Conversion chart and Worksheet #1 with answer key Materials for Activity 2: Bag with seven slips (one for each prefix: kilo-, hecto-, deca-, unit, deci-, centi-, and milli-), bag with three slips (one for each unit; gram, meter, and liter), conversion chart from previous activity, and Worksheet #2 with answer key Materials for Activity 3: Conversion chart from previous activity, task cards, and Task Cards Worksheet with answer key