# Active learning in large lectures: 12 techniques > Active learning in large lectures of 100+ students: 12 techniques that work in a tiered hall, with timings and what to do with the answers you collect. URL: https://learnworkly.com/blog/active-learning-large-lectures · Published 2026-11-14 · Tags: Formative assessment, Higher education Active learning in large lectures sounds like a contradiction. The room has fixed benches in steep rows, 200 students, one microphone and 50 minutes. Group work feels impossible, and asking "any questions?" gets silence. Yet much of the evidence for active learning in higher education comes from rooms like these: introductory science and maths courses with big enrolments. This guide gives 12 techniques that still work at that scale. Each one fits a tiered hall, takes between one and ten minutes, and produces something you can use: a vote count, a pile of one-line answers, a sketch. Later posts on this blog cover peer instruction and response questions in depth, so here each technique is a compact how-to. ## Why active learning in lectures is worth the time In 2014, Scott Freeman and colleagues pooled 225 studies of undergraduate science, engineering and maths teaching in a [PNAS meta-analysis of active learning](https://pmc.ncbi.nlm.nih.gov/articles/PMC4060654/). Exam scores were higher in active sections, and the failure rate was 21.8% with active learning against 33.8% under traditional lecturing. The authors define active learning broadly: students work through activities or discussion in class instead of only listening. There is a catch you should know before you start. A Harvard physics study by Louis Deslauriers and colleagues, [comparing actual learning with the feeling of learning](https://pmc.ncbi.nlm.nih.gov/articles/PMC6765278/), found that students in active classes scored higher on tests but felt they had learned less. A polished lecture feels fluent; effortful thinking feels like confusion. The authors' advice is simple: explain this to students early in the term, and give an early test so they can see their real progress. Two minutes on this in week one saves a lot of grumbling in week three. ## 12 techniques for active learning in large lectures ### 1. The two-minute pause Every 15 to 20 minutes, stop talking. Students reread their notes and fill gaps with the person beside them. No question, no output. It is the easiest start for a lecturer who has never tried anything active. Use it to slow down after a dense derivation. Watch the room: if pairs start arguing about one step, that step needs another pass. ### 2. Think-pair-share across the bench Ask one question. Students think alone for a minute, then talk to a neighbour on the same bench for two. In a tiered hall, pairs must be side by side; asking a row to turn round wastes time and annoys everyone. The "share" part does not scale to 200 voices, so skip the hands-up round. Call on three pairs, or collect one typed answer per student and read the spread. ### 3. Peer instruction votes Catherine Crouch and Eric Mazur described this method after ten years of using it in introductory physics at Harvard (Crouch and Mazur, 2001). Pose a conceptual multiple-choice question. Everyone votes alone. If between roughly a third and two thirds are right, students convince a neighbour, then vote again. The response tells you what to do next. Mostly right: one sentence of explanation, move on. Mostly wrong: reteach before any discussion. ### 4. Retrieval questions to open the lecture Start with three short questions on last week's material, not today's. Two minutes, no marks, answers on screen straight after. The point is the remembering, not the score. Keep a note of which question most students missed; it goes into next week's opener as well. ### 5. The minute paper In the last two minutes, ask: "What was the most important thing you learned today, and what question do you still have?" Students write a sentence for each. With 200 students you will not read every one in detail. Skim for clusters. If 40 students ask about the same step, open the next lecture with it and say why. ### 6. The muddiest point A variant of the minute paper with one question: "What was the least clear part of today?" It is quicker to answer and easier to sort. Group the answers into three or four themes. Answer the biggest theme in the next lecture, and post a short note on the rest on your course page. ### 7. Predict, observe, explain Before a demonstration, a simulation or a worked result, students commit to a prediction. Then they watch. Then they explain the difference in one sentence. The prediction must be recorded, or students rewrite their memory afterwards. A multiple-choice prediction collected from every student takes 30 seconds and shows you which wrong models are common. ### 8. Worked-example fading Show a full worked example. Then show a second one with the last step left for students to complete, a third with the last two steps left, and so on, until students do the whole problem. Each blank is a quick check. If many students cannot fill the first gap, the example went too fast and you should go back before removing more steps. ### 9. Sketch it Some understanding only shows in a picture: the shape of a graph, a force diagram, a reaction mechanism, a supply curve shift. Ask students to sketch it on paper or on their phone in two minutes. A sketch reveals what a letter answer hides. Pick three anonymous sketches, one right and two with common errors, and talk through what each one gets right. ### 10. Find the error Show a solution with one deliberate mistake. Students find the line and write what is wrong. This works well before an exam, because students practise checking, not only producing. Collect the line number from everyone. A split between two lines tells you that one step looks wrong to students even when it is correct, which is worth a minute. ### 11. Estimate first Before a calculation, ask for a rough estimate: the order of magnitude, the sign, or "bigger or smaller than last time". It takes 30 seconds and builds number sense. Show the spread of estimates afterwards. A wide spread is a good reason to spend time on reasoning about size before the formula. ### 12. The exam question rehearsal Once a week, give one past exam question under exam timing, typically five to eight minutes. Students answer alone, then compare their approach with a neighbour's. Show the mark scheme. Students mark their own work against it, and you see which part of the question costs most of the marks. ## Collecting answers from every student Several techniques above need one answer from each student, and that is where large lectures have always struggled. Hands and coloured cards only show you the brave and the front rows. A response system on students' own phones shows you all of them. *[Image: A student’s phone showing a multiple-choice question, "Which of these is a linear equation?", with answer A selected, marked 1/1 points, and a Submit button at the bottom]* In LearnWorkly, students join with a code on any phone or laptop, with no account. You run the lecture with **One by one**, so the whole hall sees the question you open and moves on when you press **Next**. The [live view](/features/live-view) fills in as answers arrive. For a peer instruction vote you see the split within seconds, and **Insights** shows the **Common wrong answer** for the question. The same session takes more than a letter. Students can type a one-line muddiest point, sketch a graph, or write a derivation with the formula keyboard. **Hide names** before you project, so you can show three anonymous sketches without embarrassing anyone. The results stay in the class afterwards, so this week's muddiest points are there when you plan next week. The Pro plan covers classes of up to 1,000 students; our [page for university lecturers](/for/university) has a worked example of a lecture with 180. ## Start small Active learning in large lectures works best when it starts small. Do not change all 50 minutes at once. Pick two techniques for the first month, one at the start and one in the middle: a retrieval opener and a peer instruction vote work well together. Tell students why you are doing it, using the Deslauriers finding. Then use what the answers tell you in the same lecture, because that is what makes students take the next question seriously. If you want more quick checks for shorter sessions and seminars, our list of [check for understanding strategies](/blog/check-for-understanding-strategies) has ideas that work with groups of any size.