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September 30, 2014

September 30, 2014

Posted by **jay** on Saturday, September 3, 2011 at 12:13am.

- math -
**ALISON**, Saturday, September 3, 2011 at 4:26amFor Calculating Percentages:

You can for example change 4.89 to .00489 % by moving the decimal two places.

or for science we usually divide the part of mass/ the whole and times it by 100 to get percentages.

Calculating ratios:

you can set up a proportion by..

x/30 = 1/3 and cross multiply and get 3x=30 and x=10.

Probability:

the probability of picking a green marble out of a total of 12 marbles in total and five of them are green would be 5/12.

Calculating Averages:

You would add all the sample of masses together and divide by how many there are. For example...you have an element with a mass of 16.00, 16.80,17.20 what is the average of the masses... you would add them up and divide by 3 since there is 3 masses. (you divide by the amount of samples)

Unknown Quantities:

you would solve for usually x or y and find your given values and determine what you are solving for and represent it with a variable.

For word problems:

It's more of a thinking type think. Common knowledge of figuring out an equation from the given information.

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