Finding Percentages on a Calculator
Date: 06/22/2006 at 20:15:50 From: Donna Subject: How do I use a calculator to check percentages How do I use a calculator to check percentages? For example, how would I check 6% of 180,000 using a calculator? Would I multiply 180,000 x 6.00%?
Date: 06/22/2006 at 22:55:39 From: Doctor Peterson Subject: Re: How do I use a calculator to check percentages Hi, Donna. Probably! Unfortunately, I've seen some variation in how calculators handle percents, so you'll want to check the instructions that came with yours to be sure. But try it out and see! What I'd do, if I had an unknown calculator with a % key, is to enter something like 200 x 5 % = and see if it gave the right answer, namely 10. (Also note whether it gives the answer even before you press "="; some work that way, and then you should learn NOT to use "=" here. That is true, for example, of the calculator that comes in Windows.) Then I might also try 5 % x 200 = and see if that worked too. (On many calculators, it won't, so I'd have learned not to do it in that order!) There's much more variation in how they handle percentage increases, like 200 + 5 % which many calculators, but not all, would take as "increase 200 by 5%", giving 210. If you need to do things like that, you'll want to be sure to check the manual. If you have any further questions, feel free to write back. - Doctor Peterson, The Math Forum http://mathforum.org/dr.math/
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