First, you should line up all of your numbers from least to greatest. Then, you subtract the smallest number from the largest and you will come up with your range. For example:
11, 12, 13, 14, 15, 16, 17, 18, 19, 20
These are already in order, so just subtract the smallest from the largest
20-11=9
Your range is 9.
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You have to rearange the numbers in order, (either from least to greatest or greatest to least) then you have to subtract them from the larger number to the smallest number, and that is your range.  You're welcome!
the range of the number is the maximum minus the minimum.
greatest-least=range
The range is the highest value minus the lowest value.
You see where it falls on the number line.