Range
The mail man came to the house between
11:05 11:27 11:35
11:35
-11:05
30
The range in time is a 30 minute difference.
The difference between the lowest and the highest values
http://www.mathgoodies.com/lessons/vol8/range.html
http://en.wikipedia.org/wiki/Range
http://www.ehow.com/about_4865897_what-range-mathematics.html
http://meanmedianmode.org/range-explained-between.html
Game
http://www.slidermath.com/probs/Range.shtml
http://www.coolmath-games.com/0-castle-defense-upgraded/index.html