Ordinal numbers differ from Cardinal numbers (or normal numbers used for counting. i.e. 1, 2, 3…) in that ordinal numbers refer to a position in a series. They are also used for days the month.
For example:
Position:
- On Monday, my first class is biology, my second class is gym.
- She ran fast and won the race. She was first.
- Her best friend doesn’t run very fast and she came in seventh.
Dates:
- Today is June the fifth.
- On February fourteenth, we celebrate Valentine’s Day.
We normally write ordinal numbers in number form and not in letter form when we talk about days of the month. We would generally write February fourteenth as February 14th .
Two important things to remember:
- Any ordinal number that doesn’t end in ‘st, nd, rd’ such as in “first”, “second”, or “third” or 1st, 2nd, 3rd, ends in th - fifth, 5th, eleventh, 11th…etc.
- All ordinal numbers from twenty-one through ninety-nine should be separated by a hyphen (twenty-two, seventy-first). A comma is optional with four-digit numbers but required with five-digit numbers (25,000 30,000).
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Ordinal Number Chart
1st - first | 11th - eleventh | 21st - twenty-first | 40th - fortieth |
2nd -second | 12th - twelfth | 22nd -twenty-second | 50th - fiftieth |
3rd - third | 13th - thirteenth | 23rd - twenty-third | 60th - sixtieth |
4th - fourth | 14th - fourteenth | 24th - twenty-fourth | 70th - seventieth |
5th - fifth | 15th - fifteenth | 25th - twenty-fifth | 80th - eightieth |
6th - sixth | 16th - sixteenth | 26th - twenty-sixth | 90th - ninetieth |
7th - seventh | 17th - seventeenth | 27th - twenty-seventh | 100th - one hundredth |
8th - eighth | 18th - eighteenth | 28th - twenty-eighth | 1000th - one thousandth |
9th - ninth | 19th - nineteenth | 29th - twenty-ninth | 100,000th - one hundred thousandth |
10 - tenth | 20th - twentieth | 30th - thirtieth | 1,000,000th - one millionth |
Practice:
Easy Ordinal Review- user:l_miguez/Ordinal_easy_activity
Ordinal Listening Review - user:l_miguez/Ordinal_Listen
Complete the Sentence with the Correct Ordinal - user:l_miguez/Ordinal_Sentence_complete
Picture Activity - user:l_miguez/Ordinals_picture_activity