Learning goals: Teacher Facing Comprehend and use the word “per” (orally and in writing) to mean “for each.” Draw and label a double number line diagram from scratch, with parallel lines and equally-spaced tick marks. Use double number line diagrams to find a wider range of equivalent ratios. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.2 Introducing Ratios, Grade 6.