DEPRECATED: Measure lengths with different units

Deprecated in 2016 for quality reasons.  Replaced with article: https://www.khanacademy.org/cc-early-math-measuring-length/a/measuring-lengths-with-different-units.

Problem

This is a rectangle.
Let's measure the start color green, g, r, e, e, n, space, l, i, n, e, end color green below using both rectangles and a centimeter ruler:
The line is
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
rectangle(s) long.
The line is
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
centimeters long.
The length of each rectangle is
than a centimeter.
So, it takes
rectangles than centimeters to measure the line.