This would make a perfect addition to your math workstations. There are 3 sets of 60 monsters to practice measuring to the nearest inch, half-inch, and quarter inch for a total of 180 monsters to measure.
Updated 4/27/14 to include an answer key.
Common Core Standards:
3.MD.4. Generate measurement data by measuring lengths using rulers marked with halves and fourths of an inch. Show the data by making a line plot, where the horizontal scale is marked off in appropriate units— whole numbers, halves, or quarters.