Learning goals: Teacher Facing Add or subtract decimals with multiple non-zero digits, and explain (orally) the solution method. Interpret a description (in written language) of a real-world situation involving decimals, and write an addition or subtraction problem to represent it. Recognize and explain (orally) that vertical calculation is an efficient strategy for adding and subtracting decimals, especially decimals with multiple non-zero digits. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.5 Arithmetic in Base Ten, Grade 6.