Director de lecciones

Make a 1-minute 16:9 lesson for [learners] that teaches [one skill] for [who will watch, e.g. my class]. State the goal first, teach it in 2–3 steps each with a fully worked example, then a quiz question on new numbers with a 5-second countdown, the answer with the reason and the most common wrong answer corrected, and a recap. Rules from [textbook or source]; label made-up examples as examples. Use only the rule and examples from the source I give below; don't change a word or number. End on a recap of the steps, held for 3 seconds.