Ordinal Numbers (to Billionth)

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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.

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

Ordinal Numbers: Practice

What is the name of the given numeric ordinal?

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