This is a set of 20 task cards designed to give students practice calculating the volume of rectangular prisms with 1 or more fractional edge units. I chose edge lengths that could be calculated without a calculator, particular if the students think carefully about which numbers are compatible and multiply in that order. These are just practice with the shapes, not embedded in a real-life situation. I did add a few challenge problems in for the later cards that involve kids finding a missing dimension.
I typically make several copies of the cards and have kids work in pairs to solve the problems, particularly if I need to work with another group in the room. I have found that kids have some great discussions, particularly about how to handle the fractions. I did include answers as distractors that match what my students tend to do incorrectly (multiply and tack on the fraction without distributing it).
This is a 7-page PDF file, which consists of 5 pages of task cards (4 per page), a 1-page recording sheet, and a 1-page answer key.