Explanation of how to use the online scientific calculator - Succeed in Physical Science and Chemistry. Also refer to calculations, arithmetic, add, subtract, multiple, divide, algebra, trigonometry, memory, sine, sin, cosine, cos, tangent, tan, exponential, square root, factorial, logarithm, Ron Kurtus, School for Champions. Copyright © Restrictions
Using a Scientific Calculator
by Ron Kurtus (23 February 2005)
A scientific calculator is an extension of the ordinary hand-held calculator you often use. It usually includes trigonometric functions such as sine and cosine, exponential functions such as square root, and miscellaneous mathematical functions. Some expensive scientific calculators even include graphic and problem solving capabilities.
We have some simple scientific calculations in the School for Champions lessons and have included an online calculator to use. You can access it from the lessons with calculation examples. This lesson includes instructions to use such a calculator.
Questions you may have include:
- What is needed to use the calculator?
- What does the calculator look like?
- How do you use it?
This lesson will answer those questions. There is a mini-quiz near the end of the lesson.
Your browser needs to have the Flash player. Most computers already are able to use the Flash animations, but if you don't see the calculator or is doesn't seem to work, you may need to download the plug-in.
If you do not see the calculator below, click Download Macromedia Flash Player. It should only take a few seconds. Unless you want the Yahoo toolbar added to your browser, uncheck that option. If you have the player but an older version, you may get a message to upgrade.
Using Flash is safe for your computer and is used in many websites.
The online calculator is used just like a real one. But note that you need can't use your keyboard to input numbers. You need to click on the numbers and functions on the calculator.
How to use it
We assume you know how to use a simple calculator to add, subtract, multiply and divide, so we'll just explain the more complex functions.
- sin, cos, tan, inv
- x^2, x^y and sqrt
- pi, ln, and n!
If you enter a number by mistake, you can use C to clear that number. It does not clear previous calculations.
If you want to clear what is on the display, click AC ("all clear"). Note that AC does not clear the memory.
Clear mistake exercise
- Click AC to clear everything you may have done before.
- Enter 12 + 3 but then realize that you really meant to enter 13 instead of 3.
- Now click C to clear the 3. Then enter 13 and click = to get the correct answer of 25.
Note that different calculators have different expressions to clear the entries. Many calculators use C to clear an entry and AC to clear all, as does our calculator. On the other hand, the calculator provided with Microsoft Windows uses CE to clear entry and C to clear all. You need to be aware of which nomenclature your calculator uses.
For some calculations, you may want to remember one calculation to use later. You can add a calculation into memory by clicking the M+ button. Then you recall it later with the MR button. You clear the memory with the MC button.
Note that M+ will add whatever you have on the display to whatever is already in the memory, so it is good to click MC before adding with M+, unless you have recently started the calculator.
Adding to memory exercise
You want to add 1 + 2 and then multiply that by the sum of 8 - 3.
You should get a total of 15.
To see how to add more to memory, click M+ and then MR. The 15 should be added to the 3 already in memory, giving you 18 when you recall memory.
1/x is simply 1 divided by whatever x is.
- Enter 5 and click 1/x to get 1/5 = 0.2
sin, cos, tan, inv
Functions used in trigonometry concerning angles are sine (sin), cosine (cos), and tangent (tan).
- If you would want to find the sine of an angle of 30 degrees, you would enter 30 and then the sin button. The answer should be 0.5.
There is also the capability of going backwards. If you know the sine, cosine or tangent, you can find the angle in degrees for that function. This is called the inverse (inv) operation. Those values are also called the arcsine, arccosine and arctangent.
- Enter 0.5, click inv and then click sin. You should get 30 (degrees) for an answer.
x^2 and x^y
x^2 means "x squared" or x2. That also means x times x or x*x.
x^y means x raised to the y power. For example, if y = 3, you would have x cubed or x3. Using this operation is tricky.
Suppose you wanted to calculate 34. That is 3*3*3*3 or 3 times itself 4 times.
sqrt means the square root of the number. It is often seen as the symbol √, but that may not show up in some older browsers.
The square root of a number is the value multiplied by itself that equals the original number.
Find the square root of 121:
- Enter 121 and click sqrt. You should get an answer of 11. (11*11 = 121.)
(You can also calculate the square root with x^y, using y = 0.5.)
pi is the number 3.14159... used in many geometry calculations. It is more often seen as the Greek letter π, but that may not show up in some older browsers.
ln is called the natural logarithm of a number. This operation is not used much.
n! represents n factorial. That means if n = 7, n! = 7*6*5*4*3*2*1. This operation is not used much.
You can use the online scientific calculator to help solve various problems. It is very similar to actual battery powered calculators.
Do your best
The following resources provide information on this subject:
Scientific Calculator - Online version from Math.com
Some calculators available from Amazon.com.
Hewlett Packard 49G+ Graphing Calculator - Costs about $120
HP 33S Scientific Calculator (F2216A) - Costs about $48
Texas Instruments BA35 Calculator - Costs about $21
The calculator was developed in Macromedia Flash by Atul Dabke in India
Mini-quiz to check your understanding
1. What does the C button do?
2. How do you find the angle whose cosine is 0.833?
3. What does 2^3 mean?
If you got all three correct, you are on your way to becoming a Champion in Physical Science. If you had problems, you had better look over the material again.
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Using a Scientific Calculator