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A 6 2 1 2 Scientific Calculator

# 6 2 1 2 Scientific Calculator

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Notation means “how to write numbers”. If a number is in standard notation then it means that the number is just one or two letters followed by digits. Sometimes this is written with a superscript, or a subscript, or in italics.

### Calculator

Some calculators follow a different order of precedence and give different answers for a/bc and a/b*c depending on entry. Engineers need to know how their calculators work and should proceed accordingly. That doesn’t change how PEMDAS should be interpreted, which by modern convention is (PE)(MD)(AS), in order of left to right. That unambiguously leads to 9 as the answer to the puzzle question if we apply that algorithm correctly. If you apply another algorithm, such as the algorithm used to program certain older TI calculators, and believe that is correct, you may come up with a different answer. You can think of constants or exact values as having infinitely many significant figures, or at least as many significant figures as the least precise number in your calculation. Use the appropriate number of significant figures when you input exact values in this calculator. In this example you would want to enter 2.00 for the constant value so that it has the same number of significant figures as the radius entry. The resulting answer would be 4.70 which has 3 significant figures.

The course describes some of the main features of a scientific calculator and encourages you to use your calculator, both for everyday arithmetic and for more complicated calculations that use the function keys as well. Key sequences, which describe which keys to press, are included in all the activities, so you can try out the ideas straightaway. (Source: www.open.edu)

### Example

A variation on the above method is to break the calculation into two parts, and use the memory functions of the calculator to store the result of the first part. The calculator memory is particularly useful when you want to calculate the values of several expressions that have a common part. This common part need be entered only once and its value reused several times subsequently. For example, rewriting the formula for the volume of wood contained in a log as

When describing how to use various calculator functions, this guide gives the exact keys that you need to press using the symbols shown on the keys. This is known as a ‘key sequence’. If the key sequence accesses the second function of a key, or a function from a menu, the name of this function will be given in brackets at the appropriate point in the key sequence. Names in brackets are thus not keys that you press but simply describe the function that is accessed using the previous key sequence. For example, to turn off the calculator, press (Source: www.open.edu)

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