Contents

Table of Contents

HP-80 OWNER’S HANDBOOK
Introduction   
7
General Operating Instructions
Getting Started
Keyboard Description
Number Entry Keys   
10
Number Control Keys   
10
Arithmetic Function Keys   
12
Dual-Function Control Key (Gold Key)   
12
Standard/Extended Function Keys   
12
Basic Keys   
12
Financial Keys   
12
Interactive Keys   
12
Fundamental Operations
Entering Data   
13
Entering Negative Numbers   
13
Rounding Numbers   
13
Loading Data   
13
Arithmetic and Basic Functions   
13
Financial and Interactive Functions   
14
Storing Constant Values   
14
Clearing Data   
15
Performing Simple Arithmetic   
15
Manipulating Data   
16
Reviewing/Verifying Data Entered   
16
Reversing Operand Order   
17
Recalling a Constant Value from Storage   
17
Basic Functions   
17
Calculating Square Root   
17
Calculating Percentage Problems   
18
Raising a Number to a Power (Exponentiation)   
19
Calculating Time Intervals   
20
Calculating Future or Past Dates   
20
Determining Day of the Week   
21
Special Operations
Financial Functions   
22
Interactive Functions   
23
Summation and Averaging Calculations   
23
Sum-of-the-Digits Calculations   
24
Trend Line Calculations   
24
Applications
Investments
Compounded Amounts   
25
Future Value of Compounded Amount   
25
Present Value of Compounded Amount   
26
Rate of Interest for Compounded Amount   
26
4