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13th or 13rd

“13th” is the correct ordinal form. Both “13rd” and “13st” are grammatically incorrect ordinal forms.

Some examples of ordinal numbers

  • 10th – tenth
  • 11th – eleventh
  • 12th – twelveth
  • 13th – thirteenth
  • 14th – fourteenth
  • 20th – twentieth (not twentyth)
  • 21st – twenty-first
  • 22nd – twenty-second
  • 23rd – twenty-third
  • 24th – twenty-fourth

13th

417,000,000 examples found

Marking the 13th National Prescription Take Back Day since September 2010, these events have altogether collected 8,103,363 (4,052 tons) of prescription drugs.

Marco Polo (1254-1324) recognized this when he got to China in the late 13th century after traveling through much of Asia.

This termination is effective with the start of the 13th month after the suspension began because you failed to cooperate.

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Filed Under: English Grammar Mistakes Tagged With: number, ordinal form

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