Ordinal Numbers (1st to 99th)

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Ordinal Numbers: Learn

Ordinal numbers are important in multiple areas. The first use of ordinal numbers is to describe the order of objects, often written in the "figure" form. Another is to name exponents (e.g. 2⁵ is "two to the fifth power"). Ordinal numbers are also used to name the denominators in fractions, often written in "full-word" form (e.g. one-third, three-fifths, six-tenths).

When ordinal numbers are written as figures the last two letters of the written ordinal are added to the cardinal number. Both the figure and the full-word formats are shown below.

First 9 Ordinal Numbers	Next 10 Ordinal Numbers
1st First 2nd Second 3rd Third 4th Fourth 5th Fifth 6th Sixth 7th Seventh 8th Eighth 9th Ninth	10th Tenth 11th Eleventh 12th Twelfth 13th Thirteenth 14th Fourteenth 15th Fifteenth 16th Sixteenth 17th Seventeenth 18th Eighteenth 19th Nineteenth
Next 10 Ordinals	Ordinal Numbers for Multiples of 10
20th Twentieth 21st Twenty-First 22nd Twenty-Second 23rd Twenty-Third 24th Twenty-Fourth 25th Twenty-Fifth 26th Twenty-Sixth 27th Twenty-Seventh 28th Twenty-Eighth 29th Twenty-Ninth	10th Tenth 20th Twentieth 30th Thirtieth 40th Fortieth 50th Fiftieth 60th Sixtieth 70th Seventieth 80th Eightieth 90th Ninetieth 100th One Hundredth 1000th One Thousandth 1000000th One Millionth 1000000000th One Billionth

The pattern established in the twenties continues for the rest of the numbers. These are called compound ordinals and only the last digit is written as an ordinal. For example, 345th is three hundred and forty-fifth.

Ordinal Numbers: Practice

Correctly Spell the Full Ordinal Number

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