Understand a fraction as a number on a number line; represent fractions on a number line diagram.
a. Represent a unit fraction (1/b ) on a number line diagram by defining the interval from 0 to 1 as the whole and partitioning it from 0 into b equal parts.
b. Represent a fraction a/b on a number line diagram by marking off a lengths of unit fractions 1/b from 0. Understand that the resulting interval has size a/b and that its endpoint locates the number a/b on the number line including values greater than 1.