Ratio

//This wiki page will give you help on mathematical ratios.//

Ratios are a part of math that you will need to know about in pre-algebra. Video from KhanAcademy.org

Here is a video tutorial to get you started.media type="youtube" key="UsPmg_Ne1po" height="385" width="480"

This is a video about how to look for equivalent ratios This video is from YourTeacher.com

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This is what you should know about ratios: 1) Most ratios are a comparison of two numbers. Which is comparing one thing to the other. 2) ratios can be written as part to part, or part to whole: (Example) There are 20 students in a classroom. 12 are boys, 8 are girls. the ratio of boys **to** girls is 12:8. The ratio of boys to the **entire class** is 12:20. 3) ratios can be written in 3 different ways: (Example) 1:2, 1/2, 1 to 2. 4) ratios can be equivalent to other ratios: (Example) 1:2= 2:4

This is a video I made myself about how to solve a math question about ratios.

http://screencast.com/t/MTEyZjk3MG

Here are a few practice problems that you can solve if you can understand the basic concepts of ratios.


 * 1) Write the ratio 2:45 in two other ways.
 * 2) There are about 2 computers for every 3 students in school. If the school has 1800 students, write the ratio of amount of computers to total number of students in school.
 * 3) There are 12 pencils and pens in a pencil case. If there are 5 pencils, write the ratio of amount of pencils to amount of pens in 3 different ways.
 * 4) True or false: the ratio of the number of boys to the total number of students in a classroom, is a part to part ratio.
 * 5) Just by looking at the ratio 3:2, do you think it is a part to part ratio, or a part to whole ratio?

You can check your answers here.

If you would like to do more questions about ratios, here is a __link __ to a connected math webpage with ratio questions.

Sites to visit for more help if you need it: @http://en.wikipedia.org/wiki/Ratio @http://www.purplemath.com/modules/ratio.htm

Ratio games: @http://www.tv411.org/mathgames/ratios.html