1.2. Addition and Subtraction
Now that we have refreshed our memory about the different kinds of numbers, let's see how they are used in the various arithmetic operations. We will start with addition and subtraction.
1.2.1. Adding and Subtracting Integers by Calculator
There are many types of calculators in use. In this text we will show screens for the TI-83 Plus calculator, which will usually be the same for the TI-84 Plus, and for TI-89 Titanium, which we shall indicate simply as TI-89.
To add two numbers by calculator, simply enter the first number; press 
; enter the second number; and press the enter key 
or the equals key 
, or the execute key 
, depending upon your particular calculator. The number we get is called the sum of the two numbers.
For subtraction we use the 
key (not the 
key). The result is called the difference of the two numbers.
TI-83/84 screen for Example 16. Your ...
Get Technical Mathematics, Sixth Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
