Saturday

March 28, 2015

March 28, 2015

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.

**Answer this Question**

**Related Questions**

math - i am taking a job related test with many math sections. I am long out of ...

Algebra - I am going to take an Accuplacer math placement test later this week. ...

math - You are paid $8.55/hr at your part-time job. You work 10 hours per week...

Health - Devon and Hunter have been going to the local skateboard park for ...

AP Biology for Kate, etc. - To save your looking for these AP Biology sites, I ...

math - This isn't a specific math question. I'm just looking for some tips for ...

Tips Plz - Can you plz tell me some studying tips for math. How can i study math...

English Essay Writing - I was wondering if I could please get some help. I am ...

English - Can someone check these sentences I need to prepare for tomorrow? ...

math - I have a problem that i need help solving. I had to drop beginning and ...