Section 1: Getting Started 25
Here are some more one-number function problems. Remember, first key in the number, then execute the function.
 1/25 = 0.0400 (25 1/x ) √360 = 18.9737 (360   ) 104 = 10,000.0000 (4 g 10x ) log 8.31434 = 0.9198 8.31434 LOG ) 712 = 5,041.0000 (71 g X2 )
Two-Number Functions
Two-number functions must have two numbers present in order for the operation to be performed. Both numbers must be in the calculator before the function is executed.  +  ,  –  ,  ×  , and  ÷  are examples of two-number functions.
When you must key in two numbers before performing an operation, use the ENTER  key to separate the two numbers.
Use the ENTER  key whenever more than one number must be keyed into the calculator before executing a function.
If you need to key in only one number for a function, you do not need to press ENTER .
To place two numbers into the calculator and perform an operation:
 1. Key in the first number. 2. Press ENTER  to separate the first number from the second. 3. Key in the second number. 4. Execute the function.
For example, to add 15 and 5:
 Keystrokes Display 15 15 _ The first number. ENTER 15.0000 Separate the first number from the second. 5 5 _ The second number. + 20.0000 The function and answer.
Other arithmetic functions are performed the same way:
To Perform Keystrokes   Display
 15 – 5
15 ENTER  5  –     10.0000
 15 × 5
15 ENTER  5  ×     75.0000
 15 ÷ 5
15 ENTER  5  ÷     3.0000