Without numbers, mathematics can not exist. There are a variety of numbers which you are required to know about.

• Real Numbers
  These are rational and irrational numbers.
  
  
• Rational Numbers
  These will always have terminating or recurring decimals. This means they can always be turned into a fraction.
  
  
• Irrational Numbers
  These can not be turned into a fraction. They are non-terminating.
  
  
• Integers
  These are whole positive or negative numbers (-3, -2, -1, 0, 1, 2, 3).
  
  
• Prime Numbers
  These are numbers with only TWO factors, itself and 1.
  
  
• Square Numbers
  These numbers are formed by a number multiplied by itself (1, 4, 9, 16...).