7 PowerPoint Mistakes That Make You Look Old - Power point rules of thumb Like 86.84% | 635 votes Views: 577 68 Download “No more than 20 slides in your presentation”. “No more than five bullet. Categories: Aunty Comments: Add Comment Cancel By JoJozilkree - 17:39 “No more than six words for each bullet. By Faushakar - 03:25 “ minutes per slide”. By Yomi - 04:44 Top tips: The golden rules of PowerPoint presentations on the picture to edit it by changing the percentage; A rule of thumb is one slide every. By Mojas - 12:36 Have you ever given a PowerPoint presentation and noticed that something about it just seemed a little off? If you’re unfamiliar with basic PowerPoint design principles, it can be difficult to create a slide show that presents your information in the best light. Poorly designed.