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Learn to use unit cubes to model the formula for volume of a right rectangular prism with fractional edge lengths in this video from KCPT. In the accompanying classroom activity, students watch the video and then use unit cubes to determine the volume of a container, rounding dimensions to the nearest half unit. To get the most from the activity, students should have experience finding the volume of right rectangular prisms with whole-number sides by packing with and counting unit cubes and by using the formula l • w • h.

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