Learning goals: Teacher Facing Apply dividing by fractions to calculate the base or height of a triangle, given its area and the other measurement. Determine the volume of a rectangular prism by counting how many $\frac12$-inch or $\frac13$-inch cubes it takes to build, and explain (orally and in writing) the solution method. Generalize that the volume of a rectangular prism with fractional edge lengths can be found by multiplying the edge lengths. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.4 Dividing Fractions, Grade 6.