# Arithmetic Series

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Videos, worksheets, games and activities to help Algebra II students learn about arithmetic series.

What is an Arithmetic Series?
An arithmetic series is the sum of terms of an arithmetic sequence.

The formulas to find the nth partial sum of an arithmetic sequence is
$${S_n} = \frac{n}{2}\left( {{a_1} + {a_n}} \right)$$ or

$${S_n} = \frac{{n\left[ {2{a_1} + (n - 1)d} \right]}}{2}$$

Arithmetic Series
Arithmetic Series
This video covers the general formula for arithmetic series

Arithmetic Series page 1
Arithmetic Series page 2

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