number line

• Number line


  A tool for visualizing how different numbers relate to each other
• Number line


  • Consists of a long horizontal line with an arrow at the end
  • Each digit has a tiny vertical mark showing where that amount belongs on the line
  • Numbers increase from left to right, decrease from right to left
  • All marks are equidistant, each number differs from its neighbor by 1
• The number line goes on forever, there is no biggest number
• Fractions


  Special numbers used to represent amounts less than 1
• Subdividing the number line

  1. Divide space between whole numbers into 10 equal parts (tenths)

  2. Divide space between tenths into 10 equal parts (hundredths)

  3. Can keep subdividing infinitely (thousands, millionths, etc.)
• Purpose of number line

  A visual representation to understand how numbers relate to each other and their range of values