# Radians & Degrees on the CLEP Scientific Calculator

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Lesson Transcript
Instructor: Heather Higinbotham
In this lesson, we'll review online calculators, in particular the CLEP online calculator. Review the difference between radians and degrees, the order of operations and scientific notation on the CLEP calculator.

## Basic Functions of the CLEP Calculator

In general, the calculator is one of the best tools that you as a mathematician have other than your brain. This is the calculator that the CLEP gives you when you're actually taking their exam. So this is an online calculator. Now this calculator works pretty much like any normal calculator would. There are a few exceptions. First, this calculator has three different modes in addition to the regular calculator mode that you're probably very used to. In addition to that mode, it has a Solver mode, a Data mode and a Graphing mode. It also has a tape history, which you can recognize by this blue circle with an 'H' in it. This history contains all of the previous commands that you've given the calculator, as well as the results of those commands.

But let's take a look at using it just as a regular calculator. You can use the buttons on the screen with your mouse to actually type in things, like 9 * 9, and then use enter for equals. As you're typing, the numbers show up on the calculator screen, but they don't actually evaluate until you hit 'Enter'. Once you do hit 'Enter', you see the answer that you evaluated - in this case 81. Next to that, you see in this case this 'H6' button. Now 'H6' means this is the sixth thing in your history. So if you go back and you click on 'H' with the blue circle around it, you'll see that this is the sixth entry. If you hit 'Clear', everything that you've typed will disappear. One of the nicest things about the calculator not evaluating what you've written until you hit 'Enter' is that you can go back and change things. So, here I write 7 - 3 * 9, but I realize I should have written 7 + 3 * 9. I can go back, highlight the minus sign and replace it with a plus sign before evaluating my answer. So, here I see I got 34 for 7 + 3 * 9.

Now this brings up an interesting case with respect to order of operations. Let's say I write 3 + 7 / 2. The order of operations on the calculator is such that it will evaluate 7 / 2 first and then add 3 to that answer. So you get 6.5. The way that you might want it, however, is to evaluate 3 + 7 first and then divide the result by 2. In this case, you want to surround 3 + 7 by parentheses, and you find that your answer is 5, which is exactly what you'd expect for 10 / 2.

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