5. Find dimensions of rectangular prisms built with fractional edge length cubes (A)
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Lesson objective: Determine how many fractionalunit cubes it takes to fill a rectangular prism of a given volume.
This lesson provides an opportunity for students to apply their knowledge and understanding of volume to a reallife situation. Students are asked to determine how many 'PowRCubes' are needed to level up in a video game; the PowRCubes are different sizes and fill differentsized rectangular prisms.
Key Concept students will use:
 The formula for volume of a rectangular prism is connected to filling the prism with unit cubes.
Skills students will use:
 finding volume using V=lwh (Grade 5, Unit 9)
 fraction multiplication (Grade 5, Unit 7)
Students engage in Mathematical Practice 7 (Look for and Make Use of Structure) as they become more fluent in using fractionaledgelength cubes to fill rectangular prisms; for example once students identify that 8 halfunit cubes have a volume of 1 cubic unit, they can determine how many cubes will fill a prism of any other volume or dimensions.
Key vocabulary:
 cubic units
 halfunit cube
 rectangular prism
 wholeunit cube
 volume
Special materials needed:
 cm cubes or unit cubes from Base Ten Blocks to represent 'halfunit' or 'onefourthunit' cubes