The Facts On File Algebra Handbook

CHARTS & TABLES Numbers

CHARTS & TABLES Numbers

Numbers (continued)

Even numbers

Any number exactly divisible by 2. Any number that ends in 0, 2, 4, 6, 8.

Imaginary number

The square root of any negative real number.

Integers

The set of integers includes any whole number, and can be negative, positive,

or zero.

{... –5, –4, –3, –2, –1, 0, 1, 2, 3, 4, 5.. .}

The names of integers as they are represented to the left of a decimal point are:

1. Units


2. Tens


3. Hundreds
   1,000 Thousands
   10,000. Ten thousands
   100,000. Hundred thousands
   1,000,000. Millions
   10,000,000. Ten millions
   100,000,000. Hundred millions
   1,000,000,000. Billions
   10,000,000,000. Ten billions
   100,000,000,000. Hundred billions
   1,000,000,000,000. Trillions (a million millions, 10^12 )
   1,000,000,000,000,000. Quadrillion (10^15 )
   1,000,000,000,000,000,000. Quintillion (10^18 )
   Sextillion (10^21 )
   Septillion (10^24 )
   Octillion (10^27 )
   Nonillion (1,000 octillions, 10^30 )
   Irrational numbers
   Any real number that is not a rational number. Irrational numbers cannot be written
   as a simple fraction.
   π
   √– 2
   (continues)