Learning goals: Teacher Facing Comprehend that manufacturers often define a maximum acceptable percent error for characteristics of their products. Determine what information is needed to solve a problem involving percent error. Ask questions to elicit that information. Generate values that fall within the acceptable range for a measurement, given a maximum percent error. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.4 Proportional Relationships and Percentages, Grade 7.