Ordinal Numbers (1st to 99th)
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|
|Next 10 Ordinals||Ordinal Numbers for Multiples of 10|
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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Math Lessons by Grade
- Estimation and Mental Math
- Naming Numbers
- Percents and Ratios
- Place Value