A functional scientific calculator with the look and feel of a real calculator for teaching how to use a calculator over the web.
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Calculator.com
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This page explains ratios and shows in detail the different ways that ratios can be written and used. Several examples are shown and a link is included where students can work on a practice problem.
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Math Is Fun
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Has several ratio and proportion problems, including word problems. Each problem is worked out, step-by-step, on the screen and with sound.
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Algebasics
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In this video, Salman Khan of Khan Academy explains growth by percentages.
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Khan Academy
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Simple ratios with pictures
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Ed Helper
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In this video, Salman Khan of Khan Academy solves more percent problems.
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Khan Academy
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In this video, Salman Khan of Khan Academy explains taking percentages.
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Khan Academy
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In this video, Salman Khan of Khan Academy solves an advanced ratio problem.
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Khan Academy
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Lesson on what Percents and Proportions are.
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Math Goodies
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