INTO THE GED
IN THIS UNIT:
Reading Passage and Practice:
Introduction to the Scientific Calculator
A calculator is a very useful tool. It makes math calculations fast and easy. Most calculators work in similar ways. Here, we will be using the Casio fx-260 solar because it is the one that people use for some parts of the GED.
In this unit, we will study basic calculations: addition, subtraction, multiplication, and division.
First, you need to find the following keys on your calculator.
To turn the Casiofx-260 solar off, place it back in its case. The lack of light will turn it off. This saves the battery for a later use.
In order to do problems with the calculator, you need to press the keys exactly as they are shown in the formulas. For example, if you see a problem like this
the result pops up.
Look at the three keys: C, AC and ► Sometimes, the difference in these keys is not very clear. Try these three problems to see what they do differently. Check your answer after you do each one.
There is one last thing you should know about the Casio. It follows the rule of order of operations. If a calculation has several steps, those steps must be in order. The calculator will do the multiplication and division calculations first. Then it will do the addition and subtraction calculations. That is the order in which all math calculations should be done.
For example, what is the answer to the equation (number problem) below?
7 + 3 X 3 = ?
The answer is 7 + 9 = 16 (First multiply 3 times 3, then add seven.) You'll work more with this idea in your math practice.
The calculator will do all kinds of problems. You don't need a calculator for simple calculations. For difficult problems, it is much easier or faster to use a calculator. A working calculator never makes mistakes unless it is broken. So you might use it to check your answers sometimes.
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