calculator

4. Perform longer calculationsusing your calculator

The volume of lumber (in cubic meters) that is contained in a log measuring metres with a distance around its middle of metres is defined by the formula

For a log of length 1.5 meters with a distance between 92 and 93 cm, this becomes

In this section , we examine the various ways that can be used to assess this , and other more complex expressions using various functions on your calculator. While the first method - considered as part of Activity 9 - is probably the easiest for this simple formula but it's also helpful to explore how you can make use of other calculatorfunctions to help you when you're faced with more complicated formulas to consider.

The formula for wood's volume is the value of . You could enter an approximate value manually, but this is time-consuming and is susceptible to error. The calculator provides an approximate value the value built in, which is obtained using this key sequence .

The keypad is located in the lower column of the pad.

Activity 9: Using the fraction key

The easiest way to finding the value is to enter it as a fraction on your calculator.

What is the key sequence that is required to determine the correct answer to 3 significant figures?

Another way to carry out the calculation of Activity 9.9 is to utilize keys. number key.

Activity 10 Using the key

There is no way to obtain the correct answer to the calculation

if you type

Input the numbers into your calculator and then press . What is the reason? Add a bracket into the expression with the / sign so that it can give the correct answer. Then type this brand new formula in the calculator and make sure you obtain the same answer similar to the example above.Reveal the answer

4.1 Reusing an earlier result

Another alternative to our calculation is to calculate the denominator for the fraction first before dividing the numerator by that.

You can note down what you know about the first part that calculates on a piece of paper and then enter it into the calculator again. However, it is possible that you've made an error in writing down the number or in typing that number into your calculator. It is better to consider the fact that the calculator will save the last calculated answer and can be inserted in the subsequent calculation using the key located in the lower part of the keypad.

Note That the key is only able to remember the results of your last calculation.

Activity 11: Bottom first!

Make use of your calculator to calculate your denominator's value the formula, and then finish this calculation by calculating the value from the three important figures.Reveal your answer

4.2 Utilizing the calculator memory

A different method is to break your calculation in two parts, and then use the memory function used by the calculator to store the outcome of the first part. The calculator memory functions are particularly helpful in situations where you have to calculate the results of several equations with a common component. The common part should be entered only once , with its value reused several times over the course of time. For example, changing the formula to calculate the amount of wood that is contained in the log.

it is clear that, regardless of the actual values for as well we can see that it is always necessary to know an amount . If we wished to calculate the volume of wood contained in several different logs, it might be efficient to calculate the amount of one time, then store it in memory , then use this amount in subsequent calculations.

The calculator has a number of different memory types. Let's first look at the memory called 'M' which is accessed using the key (and its functions) located in the lower right-hand corner of the function key.

Before you use to use the calculator memory, it's a an ideal practice to remove any previous data within the calculator using keysequences (CLR) (Memory) (Yes) .

It is important to note that this erases all memories of the calculator memories.

To save the result of an expression just calculated(i.e. an answer that is displayed on the screen's output calculator display) in the "M" calculator memory, use this key sequence (STO) (M). Here we are using two functions of the (or recall) button, which is called 'STO' (or store). After selecting the store option you must tell the calculator what memory the data will be stored in. The memory is marked in red on a few one of the calculator keys, and the memory 'M' is obtained when pressing the key. It is possible to read the key sequence as'store the current result into the"M memory'.

When (or (STO)) has been clicked, the indicator for display (RCL) (or STO) appears on the display to show that the calculator is awaiting to determine which memory to recall (store) to store the result from (in).

To display the contents of the memory 'M to display the current contents, press (M). The value stored in memory is also able to be used as an element of a subsequent calculations by inserting 'letter M' into the proper place in the expression by using (M). For example, to calculate the square of the amount currently stored in the 'M memory we could use keysequences (M) .

When there's a number stored in the 'M' memory, the display indicator M is shown at the top on the screen.

Activity 12: Memory

Save the value in the memory for 'M' in the calculator and then utilize this stored value to evaluate up to three significant figures.Reveal the answer

4.3 Other memory 'M' operations

The value that is stored in the "M" memory may also be altered by adding or subtracting the result of another calculation.

• To add the result of the most recent calculation to the value that is currently stored in memory Press .
• To subtract the value of the most recent calculation from the value currently in the memory, you can use to subtract the value of the latest calculation, use the key sequence (M-).

Expressions can also be stored within, the memory, or removed from memory at the same time as their evaluation is performed by substituting at the end of a calculation using one of the memory access sequences. To calculate, for instance, and store the result directly in the memory, employ this key sequence (STO) (M).

To clear the 'M' memory alone just store the value 0 in it with the sequence (STO) (M).

4.4 Other memories

The calculator is also equipped with six other memories, which are labelled as "A," "B," ('C'), 'D", "X" and "Y" and accessed via various keys located in the lower half of the function keys area of the calculator. Each memory's name appears in red over the key to access it.

They can be utilized exactly in the same manner as the 'M' memory, with the exception that there are no equivalents to the 'add memory' ( ) and'subtract from memory' ( (M-)) functions and there aren't any display indicators.

5 Scientific note on you calculator

Displaying scientific notation in numbers on your calculator

If the result of an equation is a number which is greater than to (i.e. ), the calculator will automatically display the result using scientific notation. For example Calculating will give the answer

,

which appears on the calculator screen in the same way as it's written here.

Small numbers are also displayed with scientific notation. But how small the number is required to be for this to happen is dependent on the type of mode that the calculator is working in:

• "Norm 1' mode uses scientific notation for any number lower that but higher in .
• 'Norm 2' mode uses in-depth scientific terminology for any number lower than but greater over .

"Norm" is short for "normal".

For Activity 1 you will have already set your calculator to work in Norm 2 mode, and we suggest for this moment, you continue to use this. To change your mode, simply use this key sequence (SETUP) (Norm) and then (for Norm 1) or (for the Norm 2 mode)).

It is also possible to set the calculator to display the results in scientific notation, with a specified number of significant figures using the key sequence (SETUP) (Sci) and then followed by the number of significant figures required such as . When your calculator is set this way, the indicator for display SCI is visible on the top of the screen. If you want to remove the setting, simply use one of the sequences of keys listed above to go back to Normal mode.