Geometric measurement: understand concepts of volume and relate volume to multiplication and to addition.
Relate volume to the operations of multiplication and addition and solve real world and mathematical problems involving volume. (5.MD.5)
c. Recognize volume as additive. Find volumes of solid figures composed of two non-overlapping right rectangular prisms by adding the volumes of the non-overlapping parts, applying this technique to solve real world problems. (5.MD.5c)
More information and the complete College and Career Readiness Standards can be found here.