BASIC ARITHMETIC

• A digit is any one of the first ten whole numbers; came from the Latin word digitus meaning "finger"
• A prime number has only 1 and itself as its factor
• A composite number has other factors aside from 1 and itself
• The number 1 is neither prime nor composite.

  
  

  The number 2 is the smallest prime number and the only even prime number
• the first ten prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
• the distance from 0 is called the absolute value fo the number