In a series of numbers, the range is the number of the lowest value subtracted from the highest value. Basically, you calculate the highest number minus the lowest number. e.g. 2 4 5 8 17 In this set of numbers, the range is 15, because 17 (the highest number) - 2 (the lowest number) = 15. Hoped this helped! :) Any questions, leave me a comment.