Learning goals: Teacher Facing Estimate quantities in a real-world situation and explain (orally and in writing) the estimation strategy. Justify (orally) why it is unreasonable to have an exact answer for a situation that involves estimation, and critique (orally) different estimates. Make simplifying assumptions and determine what information is needed to solve a Fermi problem about distance, volume, or surface area. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.9 Putting it All Together, Grade 6.