# A fractions question

• Aug 24th 2008, 07:17 AM
Senpai
A fractions question
There is a certain type of question I am having trouble with it has to do with percentages. Here is an example:

In 2006, a total of 2748 earthquakes occurred in the United States. Of these, 85.3% were minor tremors with magnitudes of 3.9 or less on the Richter scale. How many minor earthquakes occurred in the United States in 2006? Round to the nearest whole number.

I can't for the life of me figure out how to get this number. I figure it has to do with dividing but I not sure dividing what. Please if you could show work I would greatly appreciate it! So I can apply the same principles to other like questions.
• Aug 24th 2008, 07:31 AM
ticbol
Quote:

Originally Posted by Senpai
There is a certain type of question I am having trouble with it has to do with percentages. Here is an example:

In 2006, a total of 2748 earthquakes occurred in the United States. Of these, 85.3% were minor tremors with magnitudes of 3.9 or less on the Richter scale. How many minor earthquakes occurred in the United States in 2006? Round to the nearest whole number.

I can't for the life of me figure out how to get this number. I figure it has to do with dividing but I not sure dividing what. Please if you could show work I would greatly appreciate it! So I can apply the same principles to other like questions.

Relax. It is easy.

It says, 85.3% of 2748 earthquakes are minor earthquakes.
That means 85.3% of 2748 ........a repetition actually.
In Math, that is 85.3% times 2748.
Or, 0.853 * 2748
And by calculator, that is equal to 2344.
See. Easy.

Uh, do you why 85.3% is equal to 0.853?
• Aug 24th 2008, 07:36 AM
Senpai
I'm trying not to use a calculator...
But, why make it 0.853? I thought it would be to take the decimal to the right not the left side. So it would be 853...but yeah, I have no idea why you did that.
• Aug 24th 2008, 07:44 AM
Senpai
I think I get it now I'll do a few more questions like this one to get the hang of it.
A random question: Do you know what kind of calculator would be good for a intermediate algebra student?