The ActivInspire Transparency Slider is available for anything on the ActivInspire Flipchart that you select with the selector tool—just look for the little sun symbol.  Click and slide it, and watch as your image fades out of view!  It’s a great technique for comparing before-and-after, inside-vs-outside, or what-ifs.  Also, you can hide correct answers beneath a shape and slide to reveal them after students have written their answers near the shape.  It’s a super-easy tool with so many applications!
Promethean ActivInspire Transparency Slider Tool
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