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This large section lists free presentations for everything from counting to trig including addition, subtraction, multiplication, division, fractions, decimals, integers, positives and negatives, factors & primes, charts and graphs, probability, estimates, percentages, measurement, problem solving, patterns, tessellations, magic squares, square roots, algebra, geometry and more.

A great way to visually share statistics - very engaging and informative way to share information regarding life expectancy and wealth trends over the last two hundred years.  

You can "draw" on a whiteboard and record an audio explanation at the same time. You're given a url for your creation and/or you can embed it into a blog. Others can leave comments about your Sketchcast, too. It's particularly good to demonstrate concepts and allow students to access later (myclasses, moodle etc)