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An ORDINAL NUMBER is a number that shows a specific ORDER of things, such as “first,” “second,” or “third.“ Think ordinal = order.

For example, click on the picture of the runners. There's a first (1st), second (2nd), third (3rd), fourth (4th), fifth (5th), sixth (6th), seventh (7th), eighth (8th), ninth (9th) and tenth (10th) runner.

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Normally you add a "th" to the end of a cardinal number to make it an ordinal number. Be careful of the spelling exceptions!

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A CARDINAL NUMBER is a number that tells you how many of something. They show quantity (amount). We use CARDINAL NUMBERS for counting. Think cardinal = counting.

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After 20, you will start using hyphens with 1-9. You repeat this pattern until you get to 99.
FOR EXAMPLE:
21: Twenty-one
22: Twenty-two
23: Twenty-three...
30: Thirty
31: Thirty-one
32: Thirty-two...

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If you're writing a number between 1 and 10, you should write it as a word. For numbers larger than 10, you should write them as numbers. This is what I was taught in an office procedures class at BYU.

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A NOMINAL NUMBER is a number used only as a name, or to identify something.

For example, click on the picture below of the phone numbers. Phone numbers do not show quantity or order.

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I know students have experienced problems learning how to carefully pronounce "th" at the end of ordinal numbers like fifth, sixth, seventh, eighth, etc. Learning how to do this over a Zoom camera doesn't help. This video should help you with your "th" pronunciation.

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How to Pronounce TH | The ULTIMATE Guide for English Learners!