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 Description  
 Arithmetic Sequence:  A sequence of numbers in which the difference between any two consecutive terms is the same.
In other words, an arithmetic sequence occurs when you add the same number each time as you move from one term to the next term in the sequence. This fixed number is called the common difference for the sequence.

Consider the following arithmetic sequences of numbers. Could you have figured out what the common difference is in each sequence?

 Sequence Common Difference (Fixed Number Being Added Each Time)
 3, 6, 9, 12, 15,...  3
 2, 3.3, 4.6, 5.9, 7.2, 8.5, ...  1.3
 1, 3, 5, 7, ...  2


As indicated in the second example, the difference between any two consecutive terms does not have to be a whole number! In this case, it is 1.3.