An hour-long television program included 20 minutes of commercials. What fraction of the hour-long program was not commercials?

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If 20 minutes were commercials, then 40 minutes were not commercials, so 40/60 is the fraction that is not commercials, or 2/3 when reduced to simplest terms.

For more practice with fractions, go to Skill Set 3: Fractions, Proportions, and Inverse Relations.

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