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### 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.

Here are some other examples.

• 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

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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/_//\_\\   \___//   |  __//     |_||    \_____||
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