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A calculator is device for performing mathematical calculations, distinguished from a computer by having a limited problem solving ability and an interface optimized for interactive calculation rather than programming. Calculators can be hardware or software, and mechanical or electronic, and are often built into devices such as PDAs or mobile phones.

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Wikipedia about calculator

A calculator is device for performing mathematical calculations, distinguished from a computer by having a limited problem solving ability and an interface optimized for interactive calculation rather than programming. Calculators can be hardware or software, and mechanical or electronic, and are often built into devices such as PDAs or mobile phones.

Modern electronic calculators are generally small, digital, (often pocket-sized) and usually inexpensive. In addition to general purpose calculators, there are those designed for specific markets; for example, there are scientific calculators which focus on advanced math like trigonometry and statistics, or even have the ability to do computer algebra. Modern calculators are more portable than most computers, though most PDAs are comparable in size to handheld calculators.

Overview

In the past, mechanical clerical aids such as abaci, comptometers, Napier's bones, books of mathematical tables, slide rules, or mechanical adding machines were used for numeric work. This semi-manual process of calculation was tedious and error-prone.

Modern calculators are electrically powered (usually by battery and/or solar cell) and vary from cheap, give-away, credit-card sized models to sturdy adding machine-like models with built-in printers. They first became popular in the late 1960s as decreasing size and cost of electronics made possible devices for calculations, avoiding the use of scarce and expensive computer resources. By the 1980s, calculator prices had reduced to a point where a basic calculator was affordable to most. By the 1990s they had become common in math classes in schools, with the idea that students could be freed from basic calculations and focus on the concepts.

Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hoc, and calculator functions are included in almost all PDA-type devices (save a few dedicated address book and dictionary devices).

Use in education

In most countries, students use calculators for schoolwork. There was some initial resistance to the idea out of fear that basic arithmetic skills would suffer. There remains disagreement about the importance of the ability to perform calculations by hand or "in the head", with some curricula restricting calculator use until a certain level of proficiency has been obtained, while others concentrate more on teaching estimation techniques and problem-solving. Research suggests that inadequate guidance in the use of calculating tools can restrict the kind of mathematical thinking that students engage in. Others have argued that calculator use can even cause core mathematical skills to atrophy, or that such use can prevent understanding of advanced algebraic concepts.

There are other concerns - for example, that a pupil could use the calculator in the wrong fashion but believe the answer because that was the result given. Teachers try to combat this by encouraging the student to make an estimate of the result manually and ensuring it roughly agrees with the calculated result. Also, it is possible for a child to type in 1 × 1 and obtain the correct answer '1' without realizing the principle involved. In this sense, the calculator becomes a crutch rather than a learning tool, and it can slow down students in exam conditions as they check even the most trivial result on a calculator.

Search results for Calculator

Bankrate.com: Mortgage Calculator

Calculates monthly mortgage payments.www.bankrate.com/brm/mortgage-calculator.asp

Refinancing calculator -- Should you refinance your mortgage?

Refinancing calculator: This refinance calculator will figure whether it's worth chasing a lower interest rate and refinancing your mortgage.www.bankrate.com/brm/calc_vml/refi/refi.asp

Calculator

Use this calculator to help you determine whether you should take advantage of ... This calculator shows you possible savings by using an accelerated bi-weekly ...www.lfcu.com/Calculator/

FinAid | Calculators

College costs, loan payment, and financial aid calculators.www.finaid.org/calculators/

Mortgage Calculator on MSN Money

Use our Mortgage Calculator to compare mortgage payments and other monthly costs for different mortgage loan types.moneycentral.msn.com/loan/mortcalc.aspx

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News about Calculator

Extra Credit, Wednesday Edition

Portfolio.com via Yahoo! Finance Making Sense of Manhattan Real Estate: Can't be done. House Price Calculator: From OFHEO. Seems a bit optimistic. WaMu Changes Stance On Grey: It's the new blue! Global Derivatives Market now valued at $1.14 Quadrillion: Yet another entry in the meaningless-numbers stakes..http://biz.yahoo.com/portfolio/081002/tag_www_portfolio_com_...

Small worries that affect every mutual-fund investor

The Toledo BladeIn bad market times, investors don't just worry about the big things, they sweat the small stuff. For proof, consider these two questions from my mailbag, about small issues that affect every mutual-fund investor. Peter R. in Richmond, Va., writes: "I got my monthly confirmation from my mutual fund the other day and had my calculator out. "Every month, I invest $200. It's a no-load fund, so .....http://www.toledoblade.com/apps/pbcs.dll/article?AID=/200810...

Predicting Prostate Cancer Risk Through Incorporation Of Prostate Cancer Gene 3

Medical News TodayUroToday.com - Prostate cancer gene 3 is a promising new prostate cancer (CaP) biomarker as it is over-expressed in CaP tissue compared to normal prostate tissue. As such, Dr. Donna P. Ankerst and colleagues hypothesized that its inclusion in the Prostate Cancer Prevention Trial (PCPT) risk calculator may augment its predictive capabilities.http://www.medicalnewstoday.com/articles/123878.php

'The Office': Jim's best pranks!

Entertainment WeeklyAs the Dunder Mifflinites return, we revel in 16 of Jim Halpert's most inspired ideas (don't tell Dwight...) http://www.ew.com/ew/gallery/0,,20190268,00.html?xid=rss-fee...

Get The Amount You Want By Using A Serving Calculator

The Tampa TribuneHerbert Wadsager, 71, of Brandon wrote last month asking for single-serving recipes that he could make. http://www2.tbo.com/content/2008/oct/01/fl-get-the-amount-yo...

News about Calculator

Checking under the hood of Apple's new MacBooks

CNET NewsWhy do they want to look (and feel) like a cheap calculator? The black keys against the aluminum looks awful! Second, I totally agree with mjkphoto on the glossy screen. Why should I have to angle my screen to keep from getting a glare. If memory ... http://news.cnet.com/8301-17938_105-10065627-1.html

Ski in Utah, Even on a Budget

Street.Com ... In on Prime Concerns The Best National Parks for a Fall Visit The Quiet Side of Acadia National Park What Your Financial Calculator ... Even East Coast snow riders -- the new, industry-approved term combining skiers and boarders -- can frolic in the state ... http://www.thestreet.com/_aol/story/10442103/1/ski-in-utah-e...

Low flow plan down the gurgler

New Zealand Herald ... have construed the consultation document as an edict." The Department of Building and Housing is consulting on water-heating rules to apply to new homes from February. Builders and plumbers would have had the choice of using an online calculator to ... http://www.nzherald.co.nz/section/story.cfm?c_id=1&ObjectID=...

UGC pay calculator"calculator"

Newstrack IndiaFinally, Ganguly has to say goodbye (343) German, French scientists share Nobel Prize for Medicine (276) Adding colour to news from Northeast (254) Zardari's remarks show a greater flexibility (194) Bodo, Muslim clash escalating in Assam (191) Youth ... http://www.newstrackindia.com/search/?q=UGC%20pay%20calculat...

Calculator determines Breeders’ Cup wager costs

Thoroughbred TimesWith its combination of large fields and numerous exotic wagers, just calculating the cost of a pick four ticket or superfecta wager on the Breeders’ Cup World Championships can make a handicapper’s hair hurt. A feature added for 2008 on the ... http://www.thoroughbredtimes.com/national-news/2008/October/...

Search results for Calculator

Search Features

To use Google's built-in calculator function, simply enter the calculation you'd like done into the search box. http://www.google.com/help/features.html

Currency Calculator

Currency Exchange Rates Calculator. Convert any amount from one currecy to anotherhttp://www.x-rates.com/calculator.html

Calculator.org

Calculator resources, free calculator software downloads, online calculators, units conversions, physical properties and constants, books about calculators, recommended hardware ... http://www.calculator.org/

2008 Withholding Calculator

What filing status will you use on your 2008 Income Tax Return? Single Married filing joint return Married filing separate return Head of Householdhttp://www.irs.gov/individuals/page/0,,id=14806,00.html

Google Web Search Features

How to use the Google calculator. Google’s calculator tries to understand the problem you are attempting to solve without requiring you to use special syntax.http://www.google.com/help/calculator.html
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Videos found for Calculator

First Battery Powered Calculator

First Battery Powered CalculatorIn 1970 for only $348 you could get yourself the Sharp LC 8, the world's first battery powered calculator. Slide rules everywhere cried.Flash - Video

Biometics Commission Calculator

Biometics Commission CalculatorBiometics Platinum Executive Director DAVE GERHARDT demonstrates the power of EXPONENTIAL GROWTH using an interactive Commission Calculator.Flash - Video

Mr. Calculator

Mr. CalculatorCNN's Ameesh Ramah reports on a wonder kid in Egypt who is classified as a genius.Windows Media - Video

Meet The Human Calculator

Meet The Human CalculatorMichael Byster wants kids to be excited about numbers, Greg Moody reports.Windows Media - Video

Calculate your inflation rate

Calculate your inflation rateMembers of the public can now work out their own personal inflation rate using an official government website. An online calculator will enable people to work out how their...Video - Video

Videos found for Calculator

Hewlett Packard 48GX Calculator Use...

Hewlett Packard 48GX Calculator User Review 13046This is a review of a Hewlett Packard 48GX Calculator Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.expotv.com to find mo...flash: 0 MB w:400px - h:300px

Texas Instruments TI-89 Graphing Ca...

Texas Instruments TI-89 Graphing Calculator User Review 14220...Review of Texas Instruments TI-89 Graphing Calculator. Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.expotv.com to find m...flash: 0 MB w:400px - h:300px

TI_BAIIplus Calculator User Review ...

TI_BAIIplus Calculator User Review 1217TI_BAIIplus Calculator Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.expotv.com to find more video product reviews - or c...flash: 0 MB w:400px - h:300px

Casio FX-115W Scientific Calculator...

Casio FX-115W Scientific Calculator User Review 10021Review of Casio FX-115W Scientific Calculator. Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.expotv.com to find more vide...flash: 0 MB w:400px - h:300px

Texas Instruments TI-89 Graphing Ca...

Texas Instruments TI-89 Graphing Calculator User Review 4438Here is my review of the Texas Instruments TI-89 Graphing Calculator Videopinions are product reviews and demonstrations by the people who use them - infull motion video. Go to Expo TV at www.expotv....flash: 0 MB w:400px - h:300px

Answers for Calculator

Lindsey U

What is a website that is similar to crush calculator?

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Jacque

What is the best overall graphing calculator for a high school student?

JacqueTI-84 Plus Silver Edition. Used it for precal and was the best calculator I've ever had. You can add games to it, and even add notes to cheat ;)
LoveDogs!

Did the tax rebate calculator not work for you but you still got your deposit?

LoveDogs!
HorseRidingGal

How do you factorise on a graphics calculator?

HorseRidingGalIm not sure what the Casios can do as i own a Ti-84 but i had to download a separate program to do it on mine (which both factored and solved quadratic equations). Just from google this site seems ...
fountain of youth

What kind of graphing calculator should I buy?

fountain of youthFor advanced calculus a TI 94 or other 90 series calculater is good, but for the precalculas and algebra the TI 84 or 84+ is good. the cable lets it connect to other calculaters to transfer data. al...

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