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The number of slides in your presentation are irrelevant. Use as many slides as required, as long as you convey the message. What matters the most is how much your slides will engage your students in the related topic. The slides are there to support what you are saying, not to say it for you. Just mention one main point on each slide and maybe some sub points to help you expand.This means spending too much time on the same slide will definitely loose them, therefore the message should be broken into two slides if there is so much to talk about.
Pictures and videos should be included in a presentation because there are various students who engage more in the lesson with these means. They also help the students to remember what you’ve said. Make pictures as visable as possible so as to make a greater impact to aid memory.
Try to make the slides as simple as possible, exlcluding extra information like headers and footers. Sometimes unless there is a clear transition between slides, people hardly see the changes. This clear transition helps students to refocus when they got distracted. It is necessary to remind students of earlier points, therefore the teacher could switch to same slides more than once.
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