Twenty Slides for a Ten-Minute Talk? How to Cut Without Losing Your Best Work
You’ve done the reading. The essay is written, the references are tidy, and you’re quietly proud of it. Then you open PowerPoint, start pasting things across, and your ten-minute talk suddenly needs twenty slides.
I’ve watched this happen for years, to first-years and finalists alike. Nobody lacks ideas. The trouble is that every idea feels earned, so cutting one feels like binning an evening of your life.
One student told me she’d cut her deck three times and still felt sick about it. What helped wasn’t a rule. It was knowing what each slide was for.
Here’s what I tell everyone I work with. A presentation isn’t a shrunken essay. It’s a different animal.
1. Find Your Walk-Away Sentence
Before you touch a slide, ask one question. If your audience forgot everything else, what one sentence should they leave with?
Write it down. Not a topic, a claim. “This talk is about employee motivation” is a topic. “Flexible working can lift motivation, but only where managers support it and the role allows it” is a claim.
That sentence becomes your filter. Anything that supports, challenges or qualifies it stays in the running. Everything else is probably background you enjoyed researching, which isn’t the same as background they need.
Check it against your brief too. If you’ve been asked to evaluate, a tidy description won’t pick up the marks.
2. Why Good Material Goes Bad on a Screen
An essay lets readers pause, reread and flick back. A live audience can’t. They’re listening to you, reading the slide and trying to connect it all at once.
I once sat at the back of a seminar room and watched a brilliant student lose the room on slide four. Her research was excellent. We just couldn’t read it and hear her at the same time.
Your research isn’t the problem. The effort you’re asking people to spend decoding it is.
3. Try the Bus Test
Here’s a trick I use that you won’t find in most guides. Picture explaining a slide to a friend on a bus, with no screen to point at. Can you do it in two sentences?
If you can, the slide has a purpose. If you start rambling, it’s carrying two or three ideas and needs splitting or trimming.
Then rewrite the title so it makes a point. “Research findings” tells nobody anything. “Satisfaction rose, but not equally across roles” tells them exactly what to listen for.
Anyone searching for Presentation writing help usually needs this shift first: from labelling topics to making points. Colours and icons can wait.
4. Set a Slide Budget
Ten minutes usually suits six to eight content slides, plus a title and a conclusion. That’s about a minute and a quarter each.
If a slide needs three minutes of explaining, it’s really two slides pretending to be one. Your lecturer isn’t counting slides. They’re listening for whether you’ve chosen.
5. Sort Everything Into Three Piles
Stop asking, “Is this relevant?” Almost everything you found is. Ask, “Does the audience need to see this, here?”
- Show: the main claim, the key evidence, the figure that carries the argument.
- Say: context and interpretation, which land better in your own voice.
- Park: methods, extra examples and spare studies.
Parked material doesn’t vanish. Put it on a few backup slides after your conclusion. If someone asks about your sample size, you click once and look prepared rather than flustered.
Nothing is deleted. It’s just waiting its turn.
6. Don’t Cut the Caveats
Simplifying should never make evidence sound stronger than it is. A study might find that longer sleep is linked with better grades. “More sleep causes higher grades” overstates it.
“Longer sleep was associated with better grades; causation isn’t established” costs you one extra line and protects your credibility.
7. See a Paragraph Become a Slide
Say your essay contains this: “Employee motivation may be influenced by management style, development opportunities and perceived autonomy. Flexible working can give employees more control, but its effects may differ by role, communication and managerial support.”
Paste that onto a slide and people read instead of listening. Cut it to “Flexible working improves motivation” and you’ve thrown away the only interesting part.
I’d do this instead:
Flexible working and motivation
- More control over hours can help
- Manager support still matters
- Effects differ between roles
Then say the rest aloud. A role needing constant on-site cover simply can’t flex like one built on independent tasks.
I once coached a student who kept saying, “just one more line.” We counted. She’d added eleven. We took ten back out, and afterwards she told me the talk felt lighter to give.
8. Mistakes I See Every Single Term
The most common one is shrinking the font. It feels clever, like you’ve outwitted the slide. You haven’t. You’ve just made the decision harder for your audience instead of yourself.
Next comes the opposite panic: stripping a slide down to lone keywords. “Motivation, leadership, performance” looks calm and professional, but nobody knows how those words connect. Frankly, I’m not always sure the student does either.
Then there’s the chart with no message. The numbers sit there, everyone squints, and you say “as you can see.” They can’t. Give every chart a headline that states the pattern.
And please don’t read your slides aloud. I’ve done it myself in my early years and watched faces glaze over in real time. If the screen says everything, nobody needs you.
9. Test the Story Before the Design
Once you’ve trimmed, resist the urge to fiddle with fonts. Read only your slide titles, in order. Do they tell a story from question to evidence to answer?
If they feel like unrelated topics, the order is the problem, not the layout.
Then rehearse out loud with a timer, and record yourself on your phone. It’s uncomfortable, I know. But you’ll hear the missing link between two points, or the definition that turns up too late.
Ask a friend from a different course to watch. If they can repeat your main point afterwards, you’ve done it.
Running over? Don’t speak faster. Cut your weakest example instead.
Before You Hit Present
Nerves will turn up anyway. Mine always did, and they still do. But they’re far easier to carry when you know what every slide is for.
Some topics do need dense diagrams or technical detail, and that’s fine. The aim isn’t sparse slides. It’s slides your audience can follow without rebuilding your argument as you speak.
You’re not trying to show everything you did. You’re helping people understand the part that matters most. The rest of your research is still there, quietly backing you up, and that’s a good feeling to walk in with.