4.5.1-3 number systems, bases & units

• What is a Natural number?

  Positive integer from set N
• What is an integer?

  Any whole number from set Z
• What is a rational number?

  A number that can be expressed as a fraction from set Q
• What is an irrational number?

  Cannot be expressed as a fraction
• What is a real number?

  Any number from set N , Z , Q or irrational which makes set R
• What is an ordinal number?

  A number that indicates index of a sequence
• What type of number should be used for counting?

  natural
• What type of number should be used for measurements?

  real
• What is base 2?

  Binary
• What is base 16?

  Hexadecimal
• What is base 10?

  Decimal
• Why is hexadecimal sometimes used over binary?

  Easier to read and understand
• What are the units in base 2?

  kibi, mebi, gibi, tebi
• In base 2, what value do prefixes increase by?

  2^10