What is the ones digit of $1^{2009} + 2^{2009} + 3^{2009} + \cdots + 2009^{2009}?$
Question:
What is the ones digit of $1^{2009} + 2^{2009} + 3^{2009} + \cdots + 2009^{2009}?$
Answer:
Let's think step by step.

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What is the ones digit of $1^{2009} + 2^{2009} + 3^{2009} + \cdots + 2009^{2009}?$
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