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Use the letter s but not an apostrophe after the figures when expressing decades or centuries. Do, however, use an apostrophe before figures expressing a decade if numerals are left out. Examples: Classes begin Aug. 25. Purdue University was founded May 6, 1869. The semester begins in January. The 1800s. The '90s.

SOURCE: The OWL @ Purdue

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10y ago

Which time unit......

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13y ago

de

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4y ago

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Q: What is the abbreviation for decade?
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