Learning goals: Teacher Facing Comprehend that the phrase “equivalent scales” refers to different scales that relate scaled and actual measurements by the same scale factor. Generate a scale without units that is equivalent to a given scale with units, or vice versa. Justify (orally and in writing) that scales are equivalent, including scales with and without units. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.1 Scale Drawings, Grade 7.