Question

add or remove commas, if necessary, until the sentence has correct punctuation.
anais watterson won the checkers
tournament on may, 11 2010.

Explanation:

When writing a date in the format "Month Day Year", a comma is only needed after the day. In the original sentence, the comma after "May" is incorrect.

Answer:

Anais Watterson won the checkers tournament on May 11, 2010.