## Fact sheet: Using scientfic notation (Wikipedia)

August 26, 2010 by

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Well organized discussion of how to add, subtract, multiply, and divide using scientific notation, and how to convert between that and regular numbers. Note: calculators often use a different notation. The Wikipedia article has a nice little discussion showing how that works.

## Fact sheet: Number prefixes used in the SI system (Wikipedia)

August 26, 2010 by

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Well organized tables showing what the number prefixes—micro, nano, mega, giga, etc—mean and how to replace them with numbers. Note: gigabyte, megabyte, kilobyte, use a slightly different meaning for the prefixes. This can be a little confusing. The Wikipedia article has a nice little discussion of the difference between that and the SI usage.

## Fact sheet: Conversion factors for changing units (Wikipedia)

August 26, 2010 by

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Well organized tables showing conversion factors for a lot of different units. For example, if you need to know * how many feet in one kilometer * how many Newtons are in one pound * how many cubic feet are in a cubic meter Look in the table for Length for the first, the table for Force for the second, and the table for Volume, for the third, and so on.

August 26, 2010 by

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You can use Google to convert between many different units of measurement of height, weight, and volume among many others. Just enter your desired conversion into the search box and we’ll do the rest.

## Interactive java app: Zoom in by powers of ten down to the nanoscale

August 25, 2010 by

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Interactive java app that let's you zoom in and out from the cosmic scale down to the nanoscale. Good for practicing scientific notation and Greek prefixes. View the Milky Way at 10 million light years from the Earth. Then move through space towards the Earth in successive orders of magnitude until you reach a tall oak tree and move from the actual size of a leaf into a microscopic world that reveals leaf cell walls, the cell nucleus, chromatin, DNA and finally, into the subatomic universe of electrons and protons

## Fact sheet: The Scale of things

August 24, 2010 by

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Well organized graphic showing how large and small numbers are used to describe the real world. Shows pictures of objects along side of the order of magnitude of their sizes. Good for getting a feel for how the numbers are used and for making these small and large sizes comprehensible.