Math & YOU | 1.2 Rounding & Calculators

1.2 Rounding & Calculators

Page

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.
Comments (0)
These comments are not screened before publication. Constructive debate about the information on this page is welcome, but personal attacks are not. Please do not post comments that are commercial in nature or that violate copyright. Comments that we regard as obscene, defamatory, or intended to incite violence will be removed. If you find a comment offensive, you may flag it.
When posting a comment, you agree to our Terms of Use.
Add new comment as Guest or Login. Not Registered? Register

Please enter the code displayed below:

_ _ ___ _____ ___ _ _ | || | || / _ \\ / ____|| / _ \\ | | | || | || | || / //\ \\ / //---`' | / \ || | |/\| || | \\_/ || | ___ ||\ \\___ | \_/ || | /\ || \____// |_|| |_|| \_____|| \___// |_// \_|| `---` `-` `-` `----` `---` `-` `-`
Showing 0 comments

Sort by

Subscribe by email

Subscribe comments by email

Email

Subscribe by RSS

There are no comments.