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1.2 Rounding & Calculators

1.2 Rounding & Calculators
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  • Math Help

    Exponential (or scientific) notation is based on rules you learned for multiplying by powers of 10. Here are some examples.

    3.25 x 10 = 32.5 (to multiply by 10 (or 10 raised to the 1), move the decimal point 1 digit to the right.) 3.25 x 100 = 325.0 (to multiply by 100 (or 10 raised to the 2), move the decimal point 2 digits to the right.) 3.25 x 1000 = 3250.0 (to multiply by 1000 (or 10 raised to the 3), move the decimal point 3 digits to the right.)

    Here are some other examples.

    3.25 x 0.1 = 0.325 (to multiply by 0.1 (or 10 raised to the -1),move the decimal point 1 digit to the left.) 3.25 x .01 (or 10 raised to the -2), move the decimal point 2 digits to the left.)...

  • Consumer Suggestion

    Did you know that some bacteria are helpful and some are harmful whereas all viruses are harmful? Use a search engine to search for the phrase "bacteria vs. virus" to find more information about the differences between bacteria and viruses.

    Do you use hand sanitizer to stop the spread of bacteria and viruses? Go to the Natural Solutions website to view an article about the safety of hand sanitizers, or search for the phrase "harmful hand sanitizers."

  • Checkpoint Solution

    The diameter of a virus is

    3 times 10 to the minus 8 meter equals 0.00000003 meter

    In Example 3, you saw that the length of a bacteria cell is 0.000003 meter. This means that viruses are roughly 100 times smaller than bacteria. In other words, if you were the size of a bacteria cell, your cell phone would be the size of a virus.

    Another difference between viruses and bacteria is that viruses need living cells in order to reproduce. Once a virus is inside a living cell, it takes over the cell's resources and begins producing more virus particles. Bacteria do not need living cells to reproduce. In fact, bacteria live and produce in almost every environment on Earth, including water, ice, and soil.

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