Review of Introductory Mathematics
CALCULATOR OPERATIONS
Memory Key
The TI30 has only one memory. Pressing the STO key enters the displayed
number into memory. Any number already in memory will be overwritten.
Note: Calculators with more than one memory will require a number to be entered with
the STO key. For example, STO 01 means store the displayed number in memory
01; STO 20 means store the number in memory 20.
Memory Recall Key
Pressing the RCL key will retrieve the number in memory and display it. Note
that the number is also still in memory. This allows the number to be used again.
Pressing the RCL will also overwrite any number previously displayed.
Note: Calculators with more than one memory will require a number to be entered with
the RCL key. RCL 01 means recall the number stored in the 01 memory. RCL
20 means recall the number stored in memory 20.
Constant Key
Certain calculations often contain repetitive operations and numbers. The K,
constant, is a timesaving function that allows a single key stroke to perform a
single operation and number on the displayed number.
For example, if 20 numbers are to be multiplied by 17.35, the K key can be used.
Enter 17.35, then press the times key, then the K key; this "teaches" the
calculator the required operation. From this point on when entering a number and
pressing the K key, the calculator will automatically multiply the displayed
number by 17.35, saving you six key strokes.
Summation Key
If a long list of numbers is to be added, the summation key will save time if used.
Pressing the summation key adds the displayed number to the number in memory.
The final sum is then retrieved from memory.
Memory Exchange Key
The EXC, memory exchange key, swaps the displayed number with the number
in memory.
Reciprocal Key
When pressed, it divides the displayed number into one.
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